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CONSOLIDATED 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 income $ 102,561 $ 8,540
Adjustments to reconcile net income to net cash provided by operating activities:    
(Income) loss from discontinued operations (148,609) 9,587
Gain on sale of assets (7,958) (53,686)
Deferred income taxes (24,238) (3,435)
Dry hole costs and lease impairments 11,908 1,315
Impairment of oil and gas properties 652 5,350
Depreciation, depletion and amortization 170,211 162,986
Unrealized loss (gain) from derivatives 8,127 (24,610)
Debt issuance cost and discount amortization 3,218 2,103
Stock-based compensation 6,440 6,860
Excess income taxes related to stock-based compensation 2,015 1,670
Decrease (increase) in accounts receivable (20,760) 17,880
Decrease (increase) in other current assets 243 (2,889)
Increase (decrease) in accounts payable and accrued liabilities 11,917 (14,283)
Net cash provided by continuing operations 115,727 117,388
Net cash provided by (used for) discontinued operations (7,715) 24,510
Net cash provided by operating activities 108,012 141,898
CASH FLOWS FROM INVESTING ACTIVITIES:    
Capital expenditures (132,826) (258,587)
Proceeds from sales of oil and gas properties   121,322
Proceeds from sales of marketable securities 13,392 37,705
Investing activities of continuing operations (119,434) (99,560)
Cash flows from investing activities of discontinued operations:    
Capital expenditures (101,037) (89,750)
Proceeds from sale of oil and gas properties 823,701 24,750
Net cash provided by (used for) investing activities of discontinued operations 722,664 (65,000)
Net cash provided by (used for) investing activities 603,230 (164,560)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings 95,000 390,912
Principal payments on debt (537,225) (365,000)
Debt issuance costs (15) (6,535)
Tax withholding related to stock grants (1,680)  
Excess income taxes from stock-based compensation (2,015) (1,670)
Dividends paid (6,041)  
Net cash provided by (used for) financing activities (451,976) 17,707
Net increase (decrease) in cash and cash equivalents 259,266 (4,955)
Cash and cash equivalents, beginning of period 4,471 8,460
Cash and cash equivalents, end of period $ 263,737 $ 3,505