Supplemental Guarantor Information - Condensed Consolidating Statement of Cash Flows (Details) - USD ($)
$ in Thousands |
3 Months Ended |
12 Months Ended |
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Operating activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Net income (loss) |
$ 23,365
|
$ (1,297)
|
$ 33,315
|
$ 24,299
|
$ 16,483
|
[1] |
$ 45,928
|
[1] |
$ (120,922)
|
[1] |
$ (190,509)
|
[1] |
$ 79,682
|
$ (249,020)
|
$ (1,044,718)
|
| Adjustments to reconcile net income (loss) to net cash provided by operating activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Depreciation, depletion, amortization and accretion |
|
|
|
|
|
|
|
|
|
|
|
|
155,682
|
211,609
|
394,071
|
| Ceiling test write-down of oil and natural gas properties |
|
|
|
|
|
|
57,900
|
|
$ 104,600
|
|
116,600
|
|
0
|
279,063
|
987,238
|
| Gain on exchange of debt |
|
|
|
|
|
|
$ (123,900)
|
|
|
|
|
|
(7,811)
|
(123,923)
|
|
| Debt issuance costs write-down/amortization of debt items |
|
|
|
|
|
|
|
|
|
|
|
|
1,715
|
2,548
|
4,411
|
| Share-based compensation |
|
|
|
|
|
|
|
|
|
|
|
|
7,191
|
11,013
|
10,242
|
| Derivative (gain) loss |
|
|
|
|
|
|
|
|
|
|
|
|
(4,199)
|
2,926
|
(14,375)
|
| Cash receipts (payments) on derivative settlements, net |
|
|
|
|
|
|
|
|
|
|
|
|
4,199
|
4,746
|
6,703
|
| Deferred income taxes |
|
|
|
|
|
|
|
|
|
|
|
|
217
|
28,392
|
(203,272)
|
| Changes in operating assets and liabilities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Oil and natural gas receivables |
|
|
|
|
|
|
|
|
|
|
|
|
(2,370)
|
(7,005)
|
32,236
|
| Joint interest receivables |
|
|
|
|
|
|
|
|
|
|
|
|
2,131
|
12
|
21,645
|
| Insurance reimbursements |
|
|
|
|
|
|
|
|
|
|
|
|
31,740
|
|
|
| Income taxes |
|
|
|
|
|
|
|
|
|
|
|
|
(1,063)
|
(64,274)
|
(7)
|
| Prepaid expenses and other assets |
|
|
|
|
|
|
|
|
|
|
|
|
3,238
|
(14,946)
|
17,816
|
| Escrow deposit - Apache lawsuit |
|
|
|
|
|
|
|
|
|
|
|
|
(49,500)
|
|
|
| Asset retirement obligation settlements |
|
|
|
|
|
|
|
|
|
|
|
|
(72,409)
|
(72,320)
|
(32,555)
|
| Accounts payable, accrued liabilities and other |
|
|
|
|
|
|
|
|
|
|
|
|
10,965
|
5,359
|
(46,207)
|
| Net cash provided by (used in) operating activities |
|
|
|
|
|
|
|
|
|
|
|
|
159,408
|
14,180
|
133,228
|
| Investing activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Investment in oil and natural gas properties and equipment |
|
|
|
|
|
|
|
|
|
|
|
|
(130,048)
|
(48,606)
|
(230,161)
|
| Changes in operating assets and liabilities associated with investing activities |
|
|
|
|
|
|
|
|
|
|
|
|
23,874
|
(35,194)
|
(55,425)
|
| Proceeds from sales of assets, net |
|
|
|
|
|
|
|
|
|
|
|
|
|
1,500
|
372,939
|
| Purchases of furniture, fixtures and other |
|
|
|
|
|
|
|
|
|
|
|
|
(933)
|
(96)
|
(1,278)
|
| Net cash provided by (used in) investing activities |
|
|
|
|
|
|
|
|
|
|
|
|
(107,107)
|
(82,396)
|
86,075
|
| Financing activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Borrowings of long-term debt - revolving bank credit facility |
|
|
|
|
|
|
|
|
|
|
|
|
|
340,000
|
263,000
|
| Repayments of long-term debt - revolving bank credit facility |
|
|
|
|
|
|
|
|
|
|
|
|
|
(340,000)
|
(710,000)
|
| Debt exchange/issuance costs |
|
|
|
|
|
|
|
|
|
|
|
|
(421)
|
(18,464)
|
(6,669)
|
| Other |
|
|
|
|
|
|
|
|
|
|
|
|
(1,295)
|
(928)
|
(886)
|
| Net cash provided by (used in) financing activities |
|
|
|
|
|
|
|
|
|
|
|
|
(23,479)
|
53,038
|
(157,555)
|
| Increase (decrease) in cash and cash equivalents |
|
|
|
|
|
|
|
|
|
|
|
|
28,822
|
(15,178)
|
61,748
|
| Cash and cash equivalents, beginning of period |
|
|
|
70,236
|
|
|
|
|
|
|
85,414
|
|
70,236
|
85,414
|
23,666
|
| Cash and cash equivalents, end of period |
99,058
|
|
|
|
70,236
|
|
|
|
|
|
|
|
99,058
|
70,236
|
85,414
|
| Parent Company |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Net income (loss) |
|
|
|
|
|
|
|
|
|
|
|
|
82,530
|
(100,478)
|
(1,192,307)
|
| Adjustments to reconcile net income (loss) to net cash provided by operating activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Depreciation, depletion, amortization and accretion |
|
|
|
|
|
|
|
|
|
|
|
|
81,378
|
81,433
|
212,741
|
| Ceiling test write-down of oil and natural gas properties |
|
|
|
|
|
|
|
|
|
|
|
|
|
28,305
|
616,947
|
| Gain on exchange of debt |
|
|
|
|
|
|
|
|
|
|
|
|
(7,811)
|
(123,923)
|
|
| Debt issuance costs write-down/amortization of debt items |
|
|
|
|
|
|
|
|
|
|
|
|
1,715
|
2,548
|
4,411
|
| Share-based compensation |
|
|
|
|
|
|
|
|
|
|
|
|
7,191
|
11,013
|
10,242
|
| Derivative (gain) loss |
|
|
|
|
|
|
|
|
|
|
|
|
(4,199)
|
2,926
|
(14,375)
|
| Cash receipts (payments) on derivative settlements, net |
|
|
|
|
|
|
|
|
|
|
|
|
4,199
|
4,746
|
6,703
|
| Deferred income taxes |
|
|
|
|
|
|
|
|
|
|
|
|
217
|
28,048
|
(77,421)
|
| Earnings (loss) of affiliates |
|
|
|
|
|
|
|
|
|
|
|
|
(61,444)
|
109,853
|
464,931
|
| Changes in operating assets and liabilities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Oil and natural gas receivables |
|
|
|
|
|
|
|
|
|
|
|
|
(3,491)
|
1,630
|
39,078
|
| Joint interest receivables |
|
|
|
|
|
|
|
|
|
|
|
|
2,131
|
12
|
21,645
|
| Insurance reimbursements |
|
|
|
|
|
|
|
|
|
|
|
|
31,740
|
|
|
| Income taxes |
|
|
|
|
|
|
|
|
|
|
|
|
(17,586)
|
(64,274)
|
(7)
|
| Prepaid expenses and other assets |
|
|
|
|
|
|
|
|
|
|
|
|
3,447
|
(14,395)
|
(13,916)
|
| Escrow deposit - Apache lawsuit |
|
|
|
|
|
|
|
|
|
|
|
|
(49,500)
|
|
|
| Asset retirement obligation settlements |
|
|
|
|
|
|
|
|
|
|
|
|
(55,672)
|
(49,303)
|
(26,637)
|
| Accounts payable, accrued liabilities and other |
|
|
|
|
|
|
|
|
|
|
|
|
127,496
|
45,817
|
(141,608)
|
| Net cash provided by (used in) operating activities |
|
|
|
|
|
|
|
|
|
|
|
|
142,341
|
(36,042)
|
(89,573)
|
| Investing activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Investment in oil and natural gas properties and equipment |
|
|
|
|
|
|
|
|
|
|
|
|
(105,179)
|
(37,418)
|
(31,534)
|
| Changes in operating assets and liabilities associated with investing activities |
|
|
|
|
|
|
|
|
|
|
|
|
16,072
|
4,340
|
(29,806)
|
| Proceeds from sales of assets, net |
|
|
|
|
|
|
|
|
|
|
|
|
|
1,000
|
372,939
|
| Investment in subsidiary |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(1,445)
|
| Purchases of furniture, fixtures and other |
|
|
|
|
|
|
|
|
|
|
|
|
(933)
|
(96)
|
(1,278)
|
| Net cash provided by (used in) investing activities |
|
|
|
|
|
|
|
|
|
|
|
|
(90,040)
|
(32,174)
|
308,876
|
| Financing activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Borrowings of long-term debt - revolving bank credit facility |
|
|
|
|
|
|
|
|
|
|
|
|
|
340,000
|
263,000
|
| Repayments of long-term debt - revolving bank credit facility |
|
|
|
|
|
|
|
|
|
|
|
|
|
(340,000)
|
(710,000)
|
| Debt exchange/issuance costs |
|
|
|
|
|
|
|
|
|
|
|
|
(421)
|
(18,464)
|
(6,669)
|
| Other |
|
|
|
|
|
|
|
|
|
|
|
|
(1,295)
|
(928)
|
(886)
|
| Net cash provided by (used in) financing activities |
|
|
|
|
|
|
|
|
|
|
|
|
(23,479)
|
53,038
|
(157,555)
|
| Increase (decrease) in cash and cash equivalents |
|
|
|
|
|
|
|
|
|
|
|
|
28,822
|
(15,178)
|
61,748
|
| Cash and cash equivalents, beginning of period |
|
|
|
$ 70,236
|
|
|
|
|
|
|
$ 85,414
|
|
70,236
|
85,414
|
|
| Cash and cash equivalents, end of period |
$ 99,058
|
|
|
|
$ 70,236
|
|
|
|
|
|
|
|
99,058
|
70,236
|
85,414
|
| Guarantor Subsidiaries |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Net income (loss) |
|
|
|
|
|
|
|
|
|
|
|
|
61,444
|
(109,853)
|
(464,931)
|
| Adjustments to reconcile net income (loss) to net cash provided by operating activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Depreciation, depletion, amortization and accretion |
|
|
|
|
|
|
|
|
|
|
|
|
71,456
|
121,683
|
181,330
|
| Ceiling test write-down of oil and natural gas properties |
|
|
|
|
|
|
|
|
|
|
|
|
|
110,709
|
517,880
|
| Deferred income taxes |
|
|
|
|
|
|
|
|
|
|
|
|
|
344
|
(125,851)
|
| Changes in operating assets and liabilities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Oil and natural gas receivables |
|
|
|
|
|
|
|
|
|
|
|
|
1,121
|
(8,635)
|
(6,842)
|
| Income taxes |
|
|
|
|
|
|
|
|
|
|
|
|
16,523
|
|
|
| Prepaid expenses and other assets |
|
|
|
|
|
|
|
|
|
|
|
|
(108,773)
|
(78,547)
|
122,977
|
| Asset retirement obligation settlements |
|
|
|
|
|
|
|
|
|
|
|
|
(16,737)
|
(23,017)
|
(5,918)
|
| Accounts payable, accrued liabilities and other |
|
|
|
|
|
|
|
|
|
|
|
|
(7,967)
|
37,538
|
4,156
|
| Net cash provided by (used in) operating activities |
|
|
|
|
|
|
|
|
|
|
|
|
17,067
|
50,222
|
222,801
|
| Investing activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Investment in oil and natural gas properties and equipment |
|
|
|
|
|
|
|
|
|
|
|
|
(24,869)
|
(11,188)
|
(198,627)
|
| Changes in operating assets and liabilities associated with investing activities |
|
|
|
|
|
|
|
|
|
|
|
|
7,802
|
(39,534)
|
(25,619)
|
| Proceeds from sales of assets, net |
|
|
|
|
|
|
|
|
|
|
|
|
|
500
|
|
| Net cash provided by (used in) investing activities |
|
|
|
|
|
|
|
|
|
|
|
|
(17,067)
|
(50,222)
|
(224,246)
|
| Financing activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Investment from parent |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1,445
|
| Net cash provided by (used in) financing activities |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1,445
|
| 11.00% 1.5 Lien Term Loan, Due November 2019 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Financing activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Issuance of Term Loan |
|
|
|
|
|
|
|
|
|
|
|
|
|
75,000
|
|
| Payment of interest |
|
|
|
|
|
|
|
|
|
|
|
|
(8,227)
|
(2,570)
|
|
| 11.00% 1.5 Lien Term Loan, Due November 2019 | Parent Company |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Financing activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Issuance of Term Loan |
|
|
|
|
|
|
|
|
|
|
|
|
|
75,000
|
|
| Payment of interest |
|
|
|
|
|
|
|
|
|
|
|
|
(8,227)
|
(2,570)
|
|
| 9.00%/10.75% Second Lien PIK Toggle Notes, Due May 2020 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Financing activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Payment of interest |
|
|
|
|
|
|
|
|
|
|
|
|
(7,335)
|
|
|
| 9.00%/10.75% Second Lien PIK Toggle Notes, Due May 2020 | Parent Company |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Financing activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Payment of interest |
|
|
|
|
|
|
|
|
|
|
|
|
(7,335)
|
|
|
| 8.50%/10.00% Third Lien PIK Toggle Notes, Due June 2021 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Financing activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Payment of interest |
|
|
|
|
|
|
|
|
|
|
|
|
(6,201)
|
|
|
| 8.50%/10.00% Third Lien PIK Toggle Notes, Due June 2021 | Parent Company |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Financing activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Payment of interest |
|
|
|
|
|
|
|
|
|
|
|
|
(6,201)
|
|
|
| 9.00 % Second Lien Term Loan, Due May 2020 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Financing activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Issuance of Term Loan |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
297,000
|
| 9.00 % Second Lien Term Loan, Due May 2020 | Parent Company |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Financing activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Issuance of Term Loan |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
297,000
|
| Eliminations |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Net income (loss) |
|
|
|
|
|
|
|
|
|
|
|
|
(64,292)
|
(38,689)
|
612,520
|
| Adjustments to reconcile net income (loss) to net cash provided by operating activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Depreciation, depletion, amortization and accretion |
|
|
|
|
|
|
|
|
|
|
|
|
2,848
|
8,493
|
|
| Ceiling test write-down of oil and natural gas properties |
|
|
|
|
|
|
|
|
|
|
|
|
|
140,049
|
(147,589)
|
| Earnings (loss) of affiliates |
|
|
|
|
|
|
|
|
|
|
|
|
61,444
|
(109,853)
|
(464,931)
|
| Changes in operating assets and liabilities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Prepaid expenses and other assets |
|
|
|
|
|
|
|
|
|
|
|
|
108,564
|
77,996
|
(91,245)
|
| Accounts payable, accrued liabilities and other |
|
|
|
|
|
|
|
|
|
|
|
|
$ (108,564)
|
$ (77,996)
|
91,245
|
| Investing activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Investment in subsidiary |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1,445
|
| Net cash provided by (used in) investing activities |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1,445
|
| Financing activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Investment from parent |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(1,445)
|
| Net cash provided by (used in) financing activities |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ (1,445)
|
|
|