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Condensed Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net earnings $ 93,798 $ 114,914
Depreciation, depletion and amortization 138,749 100,903
Gain on sale of assets (23) (1,600)
Extinguishment of debt 0 6,842
Amortization of debt issuance costs and net discount 3,438 3,688
Impairment of oil and natural gas properties 2,467 66
Dry hole and impairment 713 211
Derivatives (30,041) (66,901)
Stock-based compensation expense 5,903 5,426
Deferred income taxes 61,639 66,782
Other, net 2,226 (524)
Allowance for bad debt 0 315
Change in book overdraft (14,885) (2,628)
Changes in operating assets and liabilities:    
Accounts receivable (16,518) 9,063
Inventories, prepaid expenses, and other current assets 242 (4,702)
Accounts payable and revenue and royalties payable (10,741) 7,755
Accrued interest and other accrued liabilities (5,007) 8,457
Net cash provided by operating activities 231,960 248,067
Cash flows from investing activities:    
Exploration and development of oil and natural gas properties (303,228) (328,968)
Property acquisitions (3,080) (24,851)
Capitalized interest (3,450) (9,723)
Proceeds from sale of assets 11,511 15,722
Deposits on asset sales 0 (3,300)
Net cash used in investing activities (298,247) (351,120)
Cash flows from financing activities:    
Long-term borrowings under credit facility 490,700 858,700
Repayments of long-term borrowings under credit facility (407,600) (989,700)
Financing obligation (223) (202)
Debt issuance costs 0 (11,424)
Dividends paid (8,803) (8,771)
Early Repayment of Senior Debt 0 149,999
Early Repayment of Subordinated Debt 0 200,000
Stock options and restricted stock issued 65 3,497
Excess income tax benefit 750 735
Net cash provided by financing activities 74,889 102,836
Net increase (decrease) in cash and cash equivalents 8,602 (217)
Cash and cash equivalents at beginning of period 312 298
Cash and cash equivalents at end of period 8,914 81
Noncash investing activities:    
Accrued capital expenditures 40,607 55,311
Asset retirement obligations 10,607 15,012
6.375% Senior notes due 2022
   
Cash flows from financing activities:    
Proceeds from issuance of 6.375% Senior notes due 2022 $ 0 $ 600,000