Quarterly report pursuant to Section 13 or 15(d)

Supplemental Guarantor Information (Condensed Consolidating Balance Sheet) (Detail)

v2.4.0.6
Supplemental Guarantor Information (Condensed Consolidating Balance Sheet) (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Current assets:        
Cash and cash equivalents $ 8,553 $ 4,512 $ 8,710 $ 28,655
Receivables:        
Oil and natural gas sales 72,429 98,550    
Joint interest and other 21,410 25,804    
Income taxes 12,033      
Total receivables 105,872 124,354    
Restricted cash and cash equivalents 30,763      
Deferred income taxes   2,007    
Prepaid expenses and other assets 54,110 30,315    
Total current assets 199,298 161,188    
Property and equipment - at cost:        
Oil and natural gas properties and equipment 6,090,065 5,959,016    
Furniture, fixtures and other 20,169 19,500    
Total property and equipment 6,110,234 5,978,516    
Less accumulated depreciation, depletion and amortization 4,484,496 4,320,410    
Net property and equipment 1,625,738 1,658,106    
Restricted deposits for asset retirement obligations 28,514 33,462    
Other assets 19,268 16,169    
Total assets 1,872,818 1,868,925    
Current liabilities:        
Accounts payable 86,215 75,871    
Undistributed oil and natural gas proceeds 35,248 33,732    
Asset retirement obligations 99,211 138,185    
Accrued liabilities 15,980 29,705    
Income taxes 363 10,392    
Deferred income taxes - current 13,081      
Total current liabilities 250,098 287,885    
Long-term debt 680,000 717,000    
Asset retirement obligations, less current portion 249,790 255,695    
Deferred income taxes 91,912 58,881    
Other liabilities 5,851 4,890    
Shareholders' equity:        
Common stock 1 1    
Additional paid-in capital 393,233 386,920    
Retained earnings 226,100 181,820    
Treasury stock, at cost (24,167) (24,167)    
Total shareholders' equity 595,167 544,574    
Total liabilities and shareholders' equity 1,872,818 1,868,925    
Parent Company
        
Current assets:        
Cash and cash equivalents 8,553 4,512 8,710 28,655
Receivables:        
Oil and natural gas sales 55,381 78,131    
Joint interest and other 21,410 25,804    
Income taxes 114,534 74,183    
Total receivables 191,325 178,118    
Restricted cash and cash equivalents 30,763      
Deferred income taxes   2,007    
Prepaid expenses and other assets 54,110 30,315    
Total current assets 284,751 214,952    
Property and equipment - at cost:        
Oil and natural gas properties and equipment 5,788,799 5,689,535    
Furniture, fixtures and other 20,169 19,500    
Total property and equipment 5,808,968 5,709,035    
Less accumulated depreciation, depletion and amortization 4,330,857 4,208,825    
Net property and equipment 1,478,111 1,500,210    
Restricted deposits for asset retirement obligations 28,514 33,462    
Other assets 413,514 372,572    
Total assets 2,204,890 2,121,196    
Current liabilities:        
Accounts payable 85,357 73,333    
Undistributed oil and natural gas proceeds 34,993 33,391    
Asset retirement obligations 99,211 138,185    
Accrued liabilities 15,980 29,705    
Deferred income taxes - current 13,081      
Total current liabilities 248,622 274,614    
Long-term debt 680,000 717,000    
Asset retirement obligations, less current portion 221,212 228,419    
Deferred income taxes 107,438 76,518    
Other liabilities 352,451 280,071    
Shareholders' equity:        
Common stock 1 1    
Additional paid-in capital 393,233 386,920    
Retained earnings 226,100 181,820    
Treasury stock, at cost (24,167) (24,167)    
Total shareholders' equity 595,167 544,574    
Total liabilities and shareholders' equity 2,204,890 2,121,196    
Guarantor Subsidiaries
        
Receivables:        
Oil and natural gas sales 17,048 20,419    
Total receivables 17,048 20,419    
Total current assets 17,048 20,419    
Property and equipment - at cost:        
Oil and natural gas properties and equipment 301,266 269,481    
Total property and equipment 301,266 269,481    
Less accumulated depreciation, depletion and amortization 153,639 111,585    
Net property and equipment 147,627 157,896    
Deferred income taxes 15,526 17,637    
Other assets 346,600 275,181    
Total assets 526,801 471,133    
Current liabilities:        
Accounts payable 858 2,538    
Undistributed oil and natural gas proceeds 255 341    
Income taxes 102,864 84,575    
Total current liabilities 103,977 87,454    
Asset retirement obligations, less current portion 28,578 27,276    
Shareholders' equity:        
Additional paid-in capital 231,759 231,759    
Retained earnings 162,487 124,644    
Total shareholders' equity 394,246 356,403    
Total liabilities and shareholders' equity 526,801 471,133    
Eliminations
        
Receivables:        
Income taxes (102,501) (74,183)    
Total receivables (102,501) (74,183)    
Total current assets (102,501) (74,183)    
Property and equipment - at cost:        
Deferred income taxes (15,526) (17,637)    
Other assets (740,846) (631,584)    
Total assets (858,873) (723,404)    
Current liabilities:        
Income taxes (102,501) (74,183)    
Total current liabilities (102,501) (74,183)    
Deferred income taxes (15,526) (17,637)    
Other liabilities (346,600) (275,181)    
Shareholders' equity:        
Additional paid-in capital (231,759) (231,759)    
Retained earnings (162,487) (124,644)    
Total shareholders' equity (394,246) (356,403)    
Total liabilities and shareholders' equity $ (858,873) $ (723,404)