Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidating Statement of Cash Flows (Detail)

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Condensed Consolidating Statement of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating activities:    
Net income $ 11,189 $ 26,618
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion 123,306 108,872
Amortization of debt issuance costs and premium 187 447
Share-based compensation 3,758 2,255
Derivative loss 7,492 3,368
Cash payments on derivative settlements (realized) (4,670) (4,271)
Deferred income taxes 6,645 12,507
Changes in operating assets and liabilities:    
Oil and natural gas receivables 2,815 423
Joint interest and other receivables 2,286 25,875
Income taxes (35) 2,372
Prepaid expenses and other assets 2,709 4,911
Asset retirement obligation settlements (16,342) (23,464)
Accounts payable, accrued liabilities and other (20,850) 9,921
Net cash provided by operating activities 118,490 169,834
Investing activities:    
Investment in oil and natural gas properties and equipment (95,067) (136,626)
Purchases of furniture, fixtures and other, net (260) (114)
Net cash used in investing activities (95,327) (136,740)
Financing activities:    
Borrowings of long-term debt - revolving bank credit facility 92,000 112,000
Repayments of long-term debt - revolving bank credit facility (103,000) (139,000)
Dividends to shareholders (7,563) (6,020)
Other (65) (42)
Net cash provided (used) in financing activities (18,628) (33,062)
Increase in cash and cash equivalents 4,535 32
Cash and cash equivalents, beginning of period 15,800 12,245
Cash and cash equivalents, end of period 20,335 12,277
Parent Company
    
Operating activities:    
Net income 11,189 26,618
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion 81,105 86,416
Amortization of debt issuance costs and premium 187 447
Share-based compensation 3,758 2,255
Derivative loss 7,492 3,368
Cash payments on derivative settlements (realized) (4,670) (4,271)
Deferred income taxes 10,722 11,774
Earnings of affiliates (14,751) (13,100)
Changes in operating assets and liabilities:    
Oil and natural gas receivables 9,172 172
Joint interest and other receivables 2,286 25,875
Income taxes (12,014) (3,957)
Prepaid expenses and other assets (51,920) 4,911
Asset retirement obligation settlements (11,936) (23,311)
Accounts payable, accrued liabilities and other 69,230 34,191
Net cash provided by operating activities 99,850 151,388
Investing activities:    
Investment in oil and natural gas properties and equipment (71,788) (118,180)
Investment in subsidiary (4,639)  
Purchases of furniture, fixtures and other, net (260) (114)
Net cash used in investing activities (76,687) (118,294)
Financing activities:    
Borrowings of long-term debt - revolving bank credit facility 92,000 112,000
Repayments of long-term debt - revolving bank credit facility (103,000) (139,000)
Dividends to shareholders (7,563) (6,020)
Other (65) (42)
Net cash provided (used) in financing activities (18,628) (33,062)
Increase in cash and cash equivalents 4,535 32
Cash and cash equivalents, beginning of period 15,800 12,245
Cash and cash equivalents, end of period 20,335 12,277
Guarantor Subsidiaries
    
Operating activities:    
Net income 14,751 13,100
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion 42,201 22,456
Deferred income taxes (4,077) 733
Changes in operating assets and liabilities:    
Oil and natural gas receivables (6,357) 251
Income taxes 11,979 6,329
Prepaid expenses and other assets (36,588) (24,155)
Asset retirement obligation settlements (4,406) (153)
Accounts payable, accrued liabilities and other 1,137 (115)
Net cash provided by operating activities 18,640 18,446
Investing activities:    
Investment in oil and natural gas properties and equipment (23,279) (18,446)
Net cash used in investing activities (23,279) (18,446)
Financing activities:    
Investment from parent 4,639  
Net cash provided (used) in financing activities 4,639  
Eliminations
    
Operating activities:    
Net income (14,751) (13,100)
Adjustments to reconcile net income to net cash provided by operating activities:    
Earnings of affiliates 14,751 13,100
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 91,217 24,155
Accounts payable, accrued liabilities and other (91,217) (24,155)
Investing activities:    
Investment in subsidiary 4,639  
Net cash used in investing activities 4,639  
Financing activities:    
Investment from parent (4,639)  
Net cash provided (used) in financing activities $ (4,639)