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Consolidated Balance Sheet (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
ASSETS    
Cash and cash equivalents $ 213,447 $ 470,872
Short-term investments 25,891 19,994
Accounts receivable - oil and gas revenues 110,341 52,164
Accounts receivable - joint interest partners 99,194 67,268
Inventory 20,707 3,543
Prepaid expenses 1,770 2,140
Advances to joint interest partners 1,985 3,935
Derivative instruments 19,016  
Deferred income taxes   3,233
Other current assets 335 491
Total current assets 492,686 623,640
Property, plant and equipment    
Oil and gas properties (successful efforts method) 2,348,128 1,235,357
Other property and equipment 49,732 20,859
Less: accumulated depreciation, depletion, amortization and impairment (391,260) (176,261)
Total property, plant and equipment, net 2,006,600 1,079,955
Derivative instruments 4,981 4,362
Deferred costs and other assets 24,527 19,425
Total assets 2,528,794 1,727,382
LIABILITIES AND STOCKHOLDERS' EQUITY    
Accounts payable 12,491 12,207
Advances from joint interest partners 21,176 9,064
Revenues and production taxes payable 71,553 19,468
Accrued liabilities 189,863 119,692
Accrued interest payable 30,096 15,774
Derivative instruments 1,048 5,907
Deferred income taxes 4,558  
Other current liabilities   472
Total current liabilities 330,785 182,584
Long-term debt 1,200,000 800,000
Asset retirement obligations 22,956 13,075
Derivative instruments 380 3,505
Deferred income taxes 177,671 92,983
Other liabilities 1,997 997
Total liabilities 1,733,789 1,093,144
Commitments and contingencies (Note 14)      
Stockholders' equity    
Common stock, $0.01 par value; 300,000,000 shares authorized; 93,432,712 issued and 93,303,298 outstanding at December 31, 2012 and 92,483,393 shares issued and 92,460,914 outstanding at December 31, 2011 925 921
Treasury stock, at cost; 129,414 and 22,479 shares at December 31, 2012 and 2011, respectively (3,796) (602)
Additional paid-in-capital 657,943 647,374
Retained earnings (deficit) 139,933 (13,455)
Total stockholders' equity 795,005 634,238
Total liabilities and stockholders' equity $ 2,528,794 $ 1,727,382