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Consolidating Financial Statements (Schedule Of Consolidating Statement Of Cash Flows) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income (loss) $ 79,390 $ (29,695) $ (15,209)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation, depletion and amortization 74,981 37,832 16,670
Impairment of oil and gas properties 3,610 11,967 6,233
Loss on sale of properties 207   (1,455)
Deferred income taxes 46,789 42,962  
Derivative instruments (1,595) 7,653 4,747
Stock-based compensation expenses 3,656 9,970  
Debt discount amortization and other 1,561 470 95
Working capital and other changes:      
Change in accounts receivable (64,900) (44,450) (6,409)
Change in inventory (2,550) (498) (218)
Change in prepaid expenses (1,600) (356) (40)
Change in other current assets (491)      
Change in other assets (139) (164) (667)
Change in accounts payable and accrued liabilities 36,316 13,917 2,440
Change in other current liabilities 472    
Change in other liabilities 317 4 (39)
Net cash provided by (used in) operating activities 176,024 49,612 6,148
Cash flows from investing activities:      
Capital expenditures (613,223) (226,544) (47,396)
Acquisition of oil and gas properties   (86,393) (35,215)
Derivative settlements (3,841) (120) 2,296
Purchases of short-term investments (184,907)      
Redemptions of short-term investments 164,913    
Advances to joint interest partners (497) 1,010 (2,331)
Advances from joint interest partners 5,963 2,512 383
Proceeds from equipment and property sales 2,202   1,507
Net cash used in investing activities (629,390) (309,535) (80,756)
Cash flows from financing activities:      
Proceeds from issuance of senior notes 800,000      
Purchases of treasury stock (602)      
Debt issuance costs (18,680) (1,788)  
Proceeds from sale of common stock   399,669  
Proceeds from credit facility   72,000 22,000
Principal payments on credit facility   (107,000) (13,000)
Net cash provided by (used in) financing activities 780,718 362,881 113,600
Increase (decrease) in cash and cash equivalents 327,352 102,958 38,992
Beginning of period 143,520 40,562 1,570
End of period 470,872 143,520 40,562
Parent/Issuer [Member]
      
Cash flows from operating activities:      
Net income (loss) 79,390 (29,695)  
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Equity in earnings of subsidiaries (99,836) 28,124  
Deferred income taxes (12,204) (954)  
Stock-based compensation expenses 3,656 1,227  
Debt discount amortization and other 1,196    
Working capital and other changes:      
Change in accounts receivable (88)    
Change in prepaid expenses (73) (236)  
Change in other current assets (18)    
Change in other assets (100)    
Change in accounts payable and accrued liabilities 17,127 306  
Net cash provided by (used in) operating activities (10,950) (1,228)  
Cash flows from investing activities:      
Purchases of short-term investments (184,907)    
Redemptions of short-term investments 164,913    
Net cash used in investing activities (19,994)    
Cash flows from financing activities:      
Proceeds from issuance of senior notes 800,000    
Purchases of treasury stock (602)    
Debt issuance costs (16,838)    
Investment in / capital contributions from subsidiaries (428,074) (278,501)  
Proceeds from sale of common stock   399,669  
Net cash provided by (used in) financing activities 354,486 121,168  
Increase (decrease) in cash and cash equivalents 323,542 119,940  
Beginning of period 119,940    
End of period 443,482 119,940  
Combined Guarantor Subsidiaries [Member]
      
Cash flows from operating activities:      
Net income (loss) 99,836 (28,124)  
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation, depletion and amortization 74,981 37,832  
Impairment of oil and gas properties 3,610 11,967  
Loss on sale of properties 207    
Deferred income taxes 58,993 43,916  
Derivative instruments (1,595) 7,653  
Stock-based compensation expenses   8,743  
Debt discount amortization and other 365 470  
Working capital and other changes:      
Change in accounts receivable (66,134) (44,756)  
Change in inventory (2,550) (498)  
Change in prepaid expenses (1,527) (120)  
Change in other current assets (473)    
Change in other assets (39) (164)  
Change in accounts payable and accrued liabilities 20,511 13,917  
Change in other current liabilities 472    
Change in other liabilities 317 4  
Net cash provided by (used in) operating activities 186,974 50,840  
Cash flows from investing activities:      
Capital expenditures (613,223) (226,544)  
Acquisition of oil and gas properties   (86,393)  
Derivative settlements (3,841) (120)  
Advances to joint interest partners (497) 1,010  
Advances from joint interest partners 5,963 2,512  
Proceeds from equipment and property sales 2,202    
Net cash used in investing activities (609,396) (309,535)  
Cash flows from financing activities:      
Debt issuance costs (1,842) (1,788)  
Investment in / capital contributions from subsidiaries 428,074 278,501  
Proceeds from credit facility   72,000  
Principal payments on credit facility   (107,000)  
Net cash provided by (used in) financing activities 426,232 241,713  
Increase (decrease) in cash and cash equivalents 3,810 (16,982)  
Beginning of period 23,580 40,562  
End of period 27,390 23,580  
Intercompany Eliminations [Member]
      
Cash flows from operating activities:      
Net income (loss) (99,836) 28,124  
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Equity in earnings of subsidiaries 99,836 (28,124)  
Working capital and other changes:      
Change in accounts receivable 1,322 306  
Change in accounts payable and accrued liabilities $ (1,322) $ (306)