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Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Balance Sheet) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
ASSETS        
Cash and cash equivalents $ 287,298 $ 470,872 $ 354,990 $ 143,520
Short-term investments   19,994    
Accounts receivable - oil and gas revenues 78,455 52,164    
Accounts receivable - joint interest partners 67,015 67,268    
Inventory 10,422 3,543    
Prepaid expenses 1,740 2,140    
Advances to joint interest partners 3,280 3,935    
Deferred income taxes 6,807 3,233    
Other current assets 80 491    
Total current assets 455,097 623,640    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 1,515,788 1,235,357    
Other property and equipment 38,660 20,859    
Less: accumulated depreciation, depletion, amortization and impairment (215,436) (176,261)    
Total property, plant and equipment, net 1,339,012 1,079,955    
Investments in and advances to subsidiaries         
Derivative instruments 486 4,362    
Deferred costs and other assets 18,815 19,425    
Total assets 1,813,410 1,727,382    
LIABILITIES AND STOCKHOLDERS' EQUITY        
Accounts payable 516 12,207    
Advances from joint interest partners 14,548 9,064    
Revenues and production taxes payable 45,276 19,468    
Accrued liabilities 139,713 119,692    
Accrued interest payable 15,024 15,774    
Derivative instruments 16,469 5,907    
Other current liabilities 316 472    
Total current liabilities 231,862 182,584    
Long-term debt 800,000 800,000    
Asset retirement obligations 15,664 13,075    
Derivative instruments 6,434 3,505    
Deferred income taxes 106,348 92,983    
Other liabilities 2,013 997    
Total liabilities 1,162,321 1,093,144    
Stockholders' equity        
Capital contributions from affiliates         
Common stock, value 922 921    
Common stock, par value $ 0.01 $ 0.01    
Common stock, shares authorized 300,000,000 300,000,000    
Common stock, shares issued 93,136,773 92,483,393    
Common stock, shares outstanding 93,074,949 92,460,914    
Treasury stock, at cost (1,783) (602)    
Treasury stock, shares 61,824 22,479    
Additional paid-in-capital 648,964 647,374    
Retained earnings (deficit) 2,986 (13,455)    
Total stockholders' equity 651,089 634,238    
Total liabilities and stockholders' equity 1,813,410 1,727,382    
Parent/Issuer [Member]
        
ASSETS        
Cash and cash equivalents 293,434 443,482 345,248 119,940
Short-term investments   19,994    
Accounts receivable - oil and gas revenues         
Accounts receivable - joint interest partners 88 88    
Inventory         
Prepaid expenses 154 309    
Advances to joint interest partners         
Deferred income taxes         
Other current assets 8 18    
Total current assets 293,684 463,891    
Property, plant and equipment        
Oil and gas properties (successful efforts method)         
Other property and equipment         
Less: accumulated depreciation, depletion, amortization and impairment         
Total property, plant and equipment, net         
Investments in and advances to subsidiaries 1,141,459 958,880    
Derivative instruments         
Deferred costs and other assets 15,262 15,742    
Total assets 1,450,405 1,438,513    
LIABILITIES AND STOCKHOLDERS' EQUITY        
Accounts payable 3,270 1,563    
Advances from joint interest partners         
Revenues and production taxes payable         
Accrued liabilities 50 103    
Accrued interest payable 15,017 15,767    
Derivative instruments         
Other current liabilities         
Total current liabilities 18,337 17,433    
Long-term debt 800,000 800,000    
Asset retirement obligations         
Derivative instruments         
Deferred income taxes (19,021) (13,158)    
Other liabilities         
Total liabilities 799,316 804,275    
Stockholders' equity        
Capital contributions from affiliates         
Common stock, value 922 921    
Treasury stock, at cost (1,783) (602)    
Additional paid-in-capital 648,964 647,374    
Retained earnings (deficit) 2,986 (13,455)    
Total stockholders' equity 651,089 634,238    
Total liabilities and stockholders' equity 1,450,405 1,438,513    
Combined Guarantor Subsidiaries [Member]
        
ASSETS        
Cash and cash equivalents (6,136) 27,390 9,742 23,580
Accounts receivable - oil and gas revenues 78,455 52,164    
Accounts receivable - joint interest partners 70,285 68,808    
Inventory 10,422 3,543    
Prepaid expenses 1,586 1,831    
Advances to joint interest partners 3,280 3,935    
Deferred income taxes 6,807 3,233    
Other current assets 72 473    
Total current assets 164,771 161,377    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 1,515,788 1,235,357    
Other property and equipment 38,660 20,859    
Less: accumulated depreciation, depletion, amortization and impairment (215,436) (176,261)    
Total property, plant and equipment, net 1,339,012 1,079,955    
Investments in and advances to subsidiaries         
Derivative instruments 486 4,362    
Deferred costs and other assets 3,553 3,683    
Total assets 1,507,822 1,249,377    
LIABILITIES AND STOCKHOLDERS' EQUITY        
Accounts payable 604 12,272    
Advances from joint interest partners 14,548 9,064    
Revenues and production taxes payable 45,276 19,468    
Accrued liabilities 139,663 119,589    
Accrued interest payable 7 7    
Derivative instruments 16,469 5,907    
Other current liabilities 316 472    
Total current liabilities 216,883 166,779    
Long-term debt         
Asset retirement obligations 15,664 13,075    
Derivative instruments 6,434 3,505    
Deferred income taxes 125,369 106,141    
Other liabilities 2,013 997    
Total liabilities 366,363 290,497    
Stockholders' equity        
Capital contributions from affiliates 1,097,890 941,575    
Common stock, value         
Treasury stock, at cost         
Additional paid-in-capital 8,743 8,743    
Retained earnings (deficit) 34,826 8,562    
Total stockholders' equity 1,141,459 958,880    
Total liabilities and stockholders' equity 1,507,822 1,249,377    
Intercompany Eliminations [Member]
        
ASSETS        
Cash and cash equivalents          
Accounts receivable - oil and gas revenues         
Accounts receivable - joint interest partners (3,358) (1,628)    
Inventory         
Prepaid expenses         
Advances to joint interest partners         
Deferred income taxes         
Other current assets         
Total current assets (3,358) (1,628)    
Property, plant and equipment        
Oil and gas properties (successful efforts method)         
Other property and equipment         
Less: accumulated depreciation, depletion, amortization and impairment         
Total property, plant and equipment, net         
Investments in and advances to subsidiaries (1,141,459) (958,880)    
Derivative instruments         
Deferred costs and other assets         
Total assets (1,144,817) (960,508)    
LIABILITIES AND STOCKHOLDERS' EQUITY        
Accounts payable (3,358) (1,628)    
Advances from joint interest partners         
Revenues and production taxes payable         
Accrued liabilities         
Accrued interest payable         
Derivative instruments         
Other current liabilities         
Total current liabilities (3,358) (1,628)    
Long-term debt         
Asset retirement obligations         
Derivative instruments         
Deferred income taxes         
Other liabilities         
Total liabilities (3,358) (1,628)    
Stockholders' equity        
Capital contributions from affiliates (1,097,890) (941,575)    
Common stock, value         
Treasury stock, at cost         
Additional paid-in-capital (8,743) (8,743)    
Retained earnings (deficit) (34,826) (8,562)    
Total stockholders' equity (1,141,459) (958,880)    
Total liabilities and stockholders' equity $ (1,144,817) $ (960,508)