Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets

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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 9,276 $ 12,245
Receivables:    
Oil and natural gas sales 80,670 97,733
Joint interest and other 22,921 56,439
Income taxes 39,556 47,884
Total receivables 143,147 202,056
Deferred income taxes - current   267
Prepaid expenses and other assets 37,214 25,555
Total current assets 189,637 240,123
Property and equipment - at cost:    
Oil and natural gas properties and equipment (full cost method, of which $127,918 at June 30, 2013 and $123,503 at December 31, 2012 were excluded from amortization) 7,009,835 6,694,510
Furniture, fixtures and other 20,848 21,786
Total property and equipment 7,030,683 6,716,296
Less accumulated depreciation, depletion and amortization 4,851,973 4,655,841
Net property and equipment 2,178,710 2,060,455
Restricted deposits for asset retirement obligations 33,469 28,466
Other assets 18,198 19,943
Total assets 2,420,014 2,348,987
Current liabilities:    
Accounts payable 123,070 123,885
Undistributed oil and natural gas proceeds 42,068 37,073
Asset retirement obligations 74,687 92,630
Accrued liabilities 13,984 21,021
Deferred income tax – current 5,760  
Total current liabilities 259,569 274,609
Long-term debt 1,099,537 1,087,611
Asset retirement obligations, less current portion 309,918 291,423
Deferred income taxes 162,948 145,249
Other liabilities 5,864 8,908
Commitments and contingencies      
Shareholders' equity:    
Preferred stock, $0.00001 par value; 20,000,000 shares authorized; 0 issued at June 30, 2013 and December 31, 2012      
Common stock, $0.00001 par value; 118,330,000 shares authorized; 78,146,253 issued and 75,277,080 outstanding at June 30, 2013, and 78,118,803 issued and 75,249,630 outstanding at December 31, 2012 1 1
Additional paid-in capital 401,097 396,186
Retained earnings 205,247 169,167
Treasury stock, at cost (24,167) (24,167)
Total shareholders' equity 582,178 541,187
Total liabilities and shareholders' equity $ 2,420,014 $ 2,348,987