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, 2012
Dec. 31, 2011
Assets    
Cash and cash equivalents $ 8,508 $ 4,512
Receivables:    
Oil and natural gas sales 89,034 98,550
Joint interest and other 27,611 25,804
Total receivables 116,645 124,354
Deferred income taxes 11,004 2,007
Prepaid expenses and other assets 22,139 30,315
Total current assets 158,296 161,188
Property and equipment - at cost:    
Oil and natural gas properties and equipment (full cost method, of which $152,077 at March 31, 2012 and $154,516 at December 31, 2011 were excluded from amortization) 6,018,210 5,959,016
Furniture, fixtures and other 20,001 19,500
Total property and equipment 6,038,211 5,978,516
Less accumulated depreciation, depletion and amortization 4,403,418 4,320,410
Net property and equipment 1,634,793 1,658,106
Restricted deposits for asset retirement obligations 35,518 33,462
Other assets 13,734 16,169
Total assets 1,842,341 1,868,925
Liabilities and Shareholders' Equity    
Accounts payable 64,992 75,871
Undistributed oil and natural gas proceeds 35,075 33,732
Asset retirement obligations 105,442 138,185
Accrued liabilities 55,049 29,705
Income taxes payable 313 10,392
Total current liabilities 260,871 287,885
Long-term debt 684,000 717,000
Asset retirement obligations, less current portion 263,037 255,695
Deferred income taxes 70,427 58,881
Other liabilities 19,590 4,890
Commitments and contingencies      
Shareholders' equity:    
Preferred stock, $0.00001 par value; 2,000,000 shares authorized; 0 issued at March 31, 2012 and December 31, 2011      
Common stock, $0.00001 par value; 118,330,000 shares authorized; 77,220,706 issued and 74,351,533 outstanding at March 31, 2012, and December 31, 2011 1 1
Additional paid-in capital 389,628 386,920
Retained earnings 178,954 181,820
Treasury stock, at cost (24,167) (24,167)
Total shareholders' equity 544,416 544,574
Total liabilities and shareholders' equity $ 1,842,341 $ 1,868,925