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
Mar. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 12,277 $ 12,245
Receivables:    
Oil and natural gas sales 97,309 97,733
Joint interest and other 35,681 56,439
Income taxes 45,638 47,884
Total receivables 178,628 202,056
Deferred income taxes 1,432 267
Prepaid expenses and other assets 22,363 25,555
Total current assets 214,700 240,123
Property and equipment - at cost:    
Oil and natural gas properties and equipment (full cost method, of which $125,485 at March 31, 2013 and $123,503 at December 31, 2012 were excluded from amortization) 6,836,590 6,694,510
Furniture, fixtures and other 21,949 21,786
Total property and equipment 6,858,539 6,716,296
Less accumulated depreciation, depletion and amortization 4,759,198 4,655,841
Net property and equipment 2,099,341 2,060,455
Restricted deposits for asset retirement obligations 29,161 28,466
Other assets 18,855 19,943
Total assets 2,362,057 2,348,987
Current liabilities:    
Accounts payable 112,223 123,885
Undistributed oil and natural gas proceeds 41,255 37,073
Asset retirement obligations 69,964 92,630
Accrued liabilities 39,067 21,021
Total current liabilities 262,509 274,609
Long-term debt 1,060,079 1,087,611
Asset retirement obligations, less current portion 308,261 291,423
Deferred income taxes 158,922 145,249
Other liabilities 8,288 8,908
Commitments and contingencies      
Shareholders' equity:    
Preferred stock, $0.00001 par value; 20,000,000 shares authorized; 0 issued at March 31, 2013 and December 31, 2012      
Common stock, $0.00001 par value; 118,330,000 shares authorized; 78,118,803 issued and 75,249,630 outstanding at March 31, 2013, and December 31, 2012 1 1
Additional paid-in capital 398,465 396,186
Retained earnings 189,699 169,167
Treasury stock, at cost (24,167) (24,167)
Total shareholders' equity 563,998 541,187
Total liabilities and shareholders' equity $ 2,362,057 $ 2,348,987