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Consolidating Financial Statements (Schedule Of Consolidating Balance Sheet) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
ASSETS        
Cash and cash equivalents $ 470,872 $ 143,520 $ 40,562 $ 1,570
Short-term investments 19,994       
Accounts receivable - oil and gas revenues 52,164 25,909    
Accounts receivable - joint interest partners 67,268 28,596    
Inventory 3,543 1,323    
Prepaid expenses 2,140 490    
Advances to joint interest partners 3,935 3,595    
Deferred income taxes 3,233 2,470    
Other current assets 491      
Total current assets 623,640 205,903    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 1,235,357 580,968    
Other property and equipment 20,859 1,970    
Less: accumulated depreciation, depletion, amortization and impairment (176,261) (99,255)    
Total property, plant and equipment, net 1,079,955 483,683    
Derivative instruments 4,362      
Deferred costs and other assets 19,425 2,266    
Total assets 1,727,382 691,852    
LIABILITIES AND STOCKHOLDERS' EQUITY        
Accounts payable 12,207 8,198    
Advances from joint interest partners 9,064 3,101    
Revenues and production taxes payable 19,468 6,180    
Accrued liabilities 119,692 58,239    
Accrued interest payable 15,774 2    
Derivative instruments 5,907 6,543    
Other current liabilities 472      
Total current liabilities 182,584 82,263    
Long-term debt 800,000       
Asset retirement obligations 13,075 7,640 6,511  
Derivative instruments 3,505 3,943    
Deferred income taxes 92,983 45,432    
Other liabilities 997 780    
Total liabilities 1,093,144 140,058    
Stockholders' equity        
Common stock, value 921 920    
Common stock, par value $ 0.01 $ 0.01    
Common stock, shares authorized 300,000,000 300,000,000    
Common stock, shares issued 92,483,393 92,240,345    
Common stock, shares outstanding 92,460,914 92,240,345    
Treasury stock, at cost; 22,479 shares (602)      
Treasury stock, shares 22,479       
Additional paid-in-capital 647,374 643,719    
Retained deficit (13,455) (92,845)    
Total stockholders' equity 634,238 551,794 171,850 82,459
Total liabilities and stockholders' equity 1,727,382 691,852    
Parent/Issuer [Member]
        
ASSETS        
Cash and cash equivalents 443,482 119,940    
Short-term investments 19,994      
Accounts receivable - joint interest partners 88      
Prepaid expenses 309 236    
Other current assets 18      
Total current assets 463,891 120,176    
Property, plant and equipment        
Investments in and advances to subsidiaries 958,880 430,970    
Deferred costs and other assets 15,742      
Total assets 1,438,513 551,146    
LIABILITIES AND STOCKHOLDERS' EQUITY        
Accounts payable 1,563 306    
Accrued liabilities 103      
Accrued interest payable 15,767      
Total current liabilities 17,433 306    
Long-term debt 800,000      
Deferred income taxes (13,158) (954)    
Total liabilities 804,275 (648)    
Stockholders' equity        
Common stock, value 921 920    
Treasury stock, at cost; 22,479 shares (602)      
Additional paid-in-capital 647,374 643,719    
Retained deficit (13,455) (92,845)    
Total stockholders' equity 634,238 551,794    
Total liabilities and stockholders' equity 1,438,513 551,146    
Combined Guarantor Subsidiaries [Member]
        
ASSETS        
Cash and cash equivalents 27,390 23,580 40,562  
Accounts receivable - oil and gas revenues 52,164 25,909    
Accounts receivable - joint interest partners 68,808 28,902    
Inventory 3,543 1,323    
Prepaid expenses 1,831 254    
Advances to joint interest partners 3,935 3,595    
Deferred income taxes 3,233 2,470    
Other current assets 473      
Total current assets 161,377 86,033    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 1,235,357 580,968    
Other property and equipment 20,859 1,970    
Less: accumulated depreciation, depletion, amortization and impairment (176,261) (99,255)    
Total property, plant and equipment, net 1,079,955 483,683    
Derivative instruments 4,362      
Deferred costs and other assets 3,683 2,266    
Total assets 1,249,377 571,982    
LIABILITIES AND STOCKHOLDERS' EQUITY        
Accounts payable 12,272 8,198    
Advances from joint interest partners 9,064 3,101    
Revenues and production taxes payable 19,468 6,180    
Accrued liabilities 119,589 58,239    
Accrued interest payable 7 2    
Derivative instruments 5,907 6,543    
Other current liabilities 472      
Total current liabilities 166,779 82,263    
Asset retirement obligations 13,075 7,640    
Derivative instruments 3,505 3,943    
Deferred income taxes 106,141 46,386    
Other liabilities 997 780    
Total liabilities 290,497 141,012    
Stockholders' equity        
Capital contributions from affiliates 941,575 513,501    
Additional paid-in-capital 8,743 8,743    
Retained deficit 8,562 (91,274)    
Total stockholders' equity 958,880 430,970    
Total liabilities and stockholders' equity 1,249,377 571,982    
Intercompany Eliminations [Member]
        
ASSETS        
Accounts receivable - joint interest partners (1,628) (306)    
Total current assets (1,628) (306)    
Property, plant and equipment        
Investments in and advances to subsidiaries (958,880) (430,970)    
Total assets (960,508) (431,276)    
LIABILITIES AND STOCKHOLDERS' EQUITY        
Accounts payable (1,628) (306)    
Total current liabilities (1,628) (306)    
Total liabilities (1,628) (306)    
Stockholders' equity        
Capital contributions from affiliates (941,575) (513,501)    
Additional paid-in-capital (8,743) (8,743)    
Retained deficit (8,562) 91,274    
Total stockholders' equity (958,880) (430,970)    
Total liabilities and stockholders' equity $ (960,508) $ (431,276)