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Condensed Consolidated Balance Sheet (Unaudited) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
ASSETS    
Cash and cash equivalents $ 161,601 $ 213,447
Short-term investments 0 25,891
Accounts receivable — oil and gas revenues 130,518 110,341
Accounts receivable — joint interest partners 92,785 99,194
Inventory 16,385 20,707
Prepaid expenses 6,121 1,770
Advances to joint interest partners 1,319 1,985
Derivative instruments 7,353 19,016
Other current assets 5 335
Total current assets 416,087 492,686
Property, plant and equipment    
Oil and gas properties (successful efforts method) 2,675,902 2,348,128
Other property and equipment 144,518 49,732
Less: accumulated depreciation, depletion, amortization and impairment (514,567) (391,260)
Total property, plant and equipment, net 2,305,853 2,006,600
Derivative instruments 10,554 4,981
Deferred costs and other assets 25,650 24,527
Total assets 2,758,144 2,528,794
LIABILITIES AND STOCKHOLDERS’ EQUITY    
Accounts payable 30,682 12,491
Advances from joint interest partners 15,583 21,176
Revenues and production taxes payable 102,661 71,553
Accrued liabilities 180,988 189,863
Accrued interest payable 29,133 30,096
Derivative instruments 0 1,048
Deferred income taxes 1,030 4,558
Other current liabilities 688 0
Total current liabilities 360,765 330,785
Long-term debt 1,200,000 1,200,000
Asset retirement obligations 26,268 22,956
Derivative instruments 291 380
Deferred income taxes 249,172 177,671
Other liabilities 2,435 1,997
Total liabilities 1,838,931 1,733,789
Commitments and contingencies (Note 13)      
Stockholders’ equity    
Common stock, $0.01 par value; 300,000,000 shares authorized; 93,693,829 issued and 93,554,121 outstanding at June 30, 2013; 93,432,712 issued and 93,303,298 outstanding at December 31, 2012 925 925
Treasury stock, at cost; 139,708 and 129,414 shares at June 30, 2013 and December 31, 2012, respectively (4,160) (3,796)
Additional paid-in-capital 663,545 657,943
Retained earnings 258,903 139,933
Total stockholders’ equity 919,213 795,005
Total liabilities and stockholders’ equity $ 2,758,144 $ 2,528,794