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Condensed Consolidated Statement of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net income $ 118,970 $ 92,484
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 133,051 83,099
Impairment of oil and gas properties 706 2,571
Deferred income taxes 67,974 55,161
Derivative instruments 2,021 (56,009)
Stock-based compensation expenses 5,371 3,898
Debt discount amortization and other 1,753 1,265
Working capital and other changes:    
Change in accounts receivable (13,768) (26,840)
Change in inventory (4,200) (21,636)
Change in prepaid expenses (4,402) 1,500
Change in other current assets 330 490
Change in other assets 0 (7,365)
Change in accounts payable and accrued liabilities 48,701 40,022
Change in other current liabilities 688 2,470
Change in other liabilities 612 750
Net cash provided by operating activities 357,807 171,860
Cash flows from investing activities:    
Capital expenditures (429,296) (440,781)
Derivative settlements 2,932 (2,465)
Redemptions of short-term investments 25,000 19,994
Advances to joint interest partners 666 1,978
Advances from joint interest partners (5,593) 19,380
Net cash used in investing activities (406,291) (401,894)
Cash flows from financing activities:    
Purchases of treasury stock (364) (1,206)
Debt issuance costs (2,998) (746)
Net cash used in financing activities (3,362) (1,952)
Decrease in cash and cash equivalents (51,846) (231,986)
Cash and cash equivalents:    
Beginning of period 213,447 470,872
End of period 161,601 238,886
Supplemental non-cash transactions:    
Change in accrued capital expenditures (6,085) 104,486
Change in asset retirement obligations $ 3,441 $ 4,185