Quarterly report pursuant to Section 13 or 15(d)

Supplemental Guarantor Information (Condensed Consolidating Statement of Cash Flows) (Detail)

v2.4.0.6
Supplemental Guarantor Information (Condensed Consolidating Statement of Cash Flows) (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Operating activities:    
Net income $ 55,315 $ 126,752
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion 251,894 241,917
Amortization of debt issuance costs 2,046 1,401
Loss on extinguishment of debt   22,694
Share-based compensation 9,137 6,437
Derivative gain 14,421 (10,815)
Cash payments on derivative settlements (6,960) (9,239)
Deferred income taxes 44,465 59,442
Changes in operating assets and liabilities:    
Oil and natural gas receivables 30,320 (2,913)
Joint interest and other receivables 3,935 7,465
Insurance receivables 500 18,971
Income taxes (24,327) (15,894)
Prepaid expenses and other assets 670 (22,601)
Asset retirement obligations (63,150) (51,349)
Accounts payable and accrued liabilities 32,311 23,892
Other liabilities 912 (109)
Net cash provided by operating activities 351,489 396,051
Investing activities:    
Acquisition of significant property interest in oil and natural gas properties   (434,582)
Investment in oil and natural gas properties and equipment (312,372) (185,222)
Proceeds from sales of oil and gas properties and equipment 30,453 15
Change in restricted cash (24,026)  
Deposit for acquisition (22,800)  
Purchases of furniture, fixtures and other (2,125) (318)
Net cash used in investing activities (330,870) (620,107)
Financing activities:    
Issuance of 8.5% Senior Notes   600,000
Repurchase of 8.25% Senior Notes   (450,000)
Borrowings of long-term debt - revolving bank credit facility 316,000 512,000
Repayments of long-term debt - revolving bank credit facility (314,000) (418,000)
Debt issuance costs (2,081) (31,997)
Dividends to shareholders (17,848) (8,936)
Other (209)  
Net cash (used in) provided by financing activities (18,138) 203,067
Decrease in cash and cash equivalents 2,481 (20,989)
Cash and cash equivalents, beginning of period 4,512 28,655
Cash and cash equivalents, end of period 6,993 7,666
Parent Company [Member]
    
Operating activities:    
Net income 55,315 126,752
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion 189,827 176,999
Amortization of debt issuance costs 2,046 1,401
Loss on extinguishment of debt   22,694
Share-based compensation 9,137 6,437
Derivative gain 14,421 (10,815)
Cash payments on derivative settlements (6,960) (9,239)
Deferred income taxes 42,816 68,350
Earnings of affiliates (50,395) (65,550)
Changes in operating assets and liabilities:    
Oil and natural gas receivables 24,162 (10,946)
Joint interest and other receivables 3,935 7,465
Insurance receivables 500 18,971
Income taxes (49,830) (60,099)
Prepaid expenses and other assets 669 (22,796)
Asset retirement obligations (63,150) (51,349)
Accounts payable and accrued liabilities 34,063 25,717
Other liabilities 102,386 165,387
Net cash provided by operating activities 308,942 389,379
Investing activities:    
Acquisition of significant property interest in oil and natural gas properties   (434,582)
Investment in oil and natural gas properties and equipment (269,825) (183,735)
Investment in subsidiary   5,185
Proceeds from sales of oil and gas properties and equipment 30,453  
Change in restricted cash (24,026)  
Deposit for acquisition (22,800)  
Purchases of furniture, fixtures and other (2,125) (303)
Net cash used in investing activities (288,323) (613,435)
Financing activities:    
Issuance of 8.5% Senior Notes   600,000
Repurchase of 8.25% Senior Notes   (450,000)
Borrowings of long-term debt - revolving bank credit facility 316,000 512,000
Repayments of long-term debt - revolving bank credit facility (314,000) (418,000)
Debt issuance costs (2,081) (31,997)
Dividends to shareholders (17,848) (8,936)
Other (209)  
Net cash (used in) provided by financing activities (18,138) 203,067
Decrease in cash and cash equivalents 2,481 (20,989)
Cash and cash equivalents, beginning of period 4,512 28,655
Cash and cash equivalents, end of period 6,993 7,666
Guarantor Subsidiaries [Member]
    
Operating activities:    
Net income 50,395 65,550
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion 62,067 64,918
Deferred income taxes 1,649 (8,908)
Changes in operating assets and liabilities:    
Oil and natural gas receivables 6,158 8,033
Income taxes 25,503 44,205
Prepaid expenses and other assets (101,473) (165,495)
Accounts payable and accrued liabilities (1,752) (1,631)
Net cash provided by operating activities 42,547 6,672
Investing activities:    
Investment in oil and natural gas properties and equipment (42,547) (1,487)
Net cash used in investing activities (42,547) (1,487)
Financing activities:    
Investment from parent   (5,185)
Net cash (used in) provided by financing activities   (5,185)
Eliminations [Member]
    
Operating activities:    
Net income (50,395) (65,550)
Adjustments to reconcile net income to net cash provided by operating activities:    
Earnings of affiliates 50,395 65,550
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 101,474 165,690
Accounts payable and accrued liabilities   (194)
Other liabilities (101,474) (165,496)
Investing activities:    
Investment in subsidiary   (5,185)
Net cash used in investing activities   (5,185)
Financing activities:    
Investment from parent   5,185
Net cash (used in) provided by financing activities   $ 5,185