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Condensed Consolidated Balance Sheet (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
ASSETS    
Cash and cash equivalents $ 165,989 $ 213,447
Short-term investments 25,891 25,891
Accounts receivable - oil and gas revenues 132,069 110,341
Accounts receivable - joint interest partners 80,826 99,194
Inventory 25,406 20,707
Prepaid expenses 1,422 1,770
Advances to joint interest partners 2,126 1,985
Derivative instruments 5,647 19,016
Other current assets 1,134 335
Total current assets 440,510 492,686
Property, plant and equipment    
Oil and gas properties (successful efforts method) 2,487,198 2,348,128
Other property and equipment 136,676 49,732
Less: accumulated depreciation, depletion, amortization and impairment (446,666) (391,260)
Total property, plant and equipment, net 2,177,208 2,006,600
Derivative instruments 5,284 4,981
Deferred costs and other assets 23,716 24,527
Total assets 2,646,718 2,528,794
LIABILITIES AND STOCKHOLDERS' EQUITY    
Accounts payable 23,560 12,491
Advances from joint interest partners 19,485 21,176
Revenues and production taxes payable 90,372 71,553
Accrued liabilities 197,326 189,863
Accrued interest payable 21,488 30,096
Derivative instruments 4,660 1,048
Deferred income taxes    4,558
Total current liabilities 356,891 330,785
Long-term debt 1,200,000 1,200,000
Asset retirement obligations 25,029 22,956
Derivative instruments   380
Deferred income taxes 213,783 177,671
Other liabilities 1,908 1,997
Total liabilities 1,797,611 1,733,789
Commitments and contingencies (Note 13)      
Stockholders' equity    
Common stock, $0.01 par value; 300,000,000 shares authorized; 93,730,917 issued and 93,596,984 outstanding at March 31, 2013; 93,432,712 issued and 93,303,298 outstanding at December 31, 2012 925 925
Treasury stock, at cost; 133,933 and 129,414 shares at March 31, 2013 and December 31, 2012, respectively (3,952) (3,796)
Additional paid-in-capital 660,350 657,943
Retained earnings 191,784 139,933
Total stockholders' equity 849,107 795,005
Total liabilities and stockholders' equity $ 2,646,718 $ 2,528,794