Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidating Balance Sheet (Detail)

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Condensed Consolidating Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Current assets:        
Cash and cash equivalents $ 9,276 $ 12,245 $ 8,553 $ 4,512
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 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    
Deferred income taxes          
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    
Shareholders' equity:        
Common stock 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    
Parent Company
        
Current assets:        
Cash and cash equivalents 9,276 12,245 8,553 4,512
Receivables:        
Oil and natural gas sales 65,290 80,729    
Joint interest and other 22,921 56,439    
Income taxes 165,239 163,750    
Total receivables 253,450 300,918    
Deferred income taxes - current   267    
Prepaid expenses and other assets 37,214 25,555    
Total current assets 299,940 338,985    
Property and equipment - at cost:        
Oil and natural gas properties and equipment 6,624,347 6,356,529    
Furniture, fixtures and other 20,848 21,786    
Total property and equipment 6,645,195 6,378,315    
Less accumulated depreciation, depletion and amortization 4,614,980 4,461,886    
Net property and equipment 2,030,215 1,916,429    
Restricted deposits for asset retirement obligations 33,469 28,466    
Deferred income taxes          
Other assets 468,352 442,540    
Total assets 2,831,976 2,726,420    
Current liabilities:        
Accounts payable 123,101 123,792    
Undistributed oil and natural gas proceeds 41,788 36,791    
Asset retirement obligations 74,687 92,595    
Accrued liabilities 13,468 20,755    
Deferred income tax – current 5,760      
Total current liabilities 258,804 273,933    
Long-term debt 1,099,537 1,087,611    
Asset retirement obligations, less current portion 279,295 262,524    
Deferred income taxes 171,637 158,758    
Other liabilities 440,525 402,407    
Shareholders' equity:        
Common stock 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 2,831,976 2,726,420    
Guarantor Subsidiaries
        
Current assets:        
Cash and cash equivalents          
Receivables:        
Oil and natural gas sales 15,411 17,004    
Joint interest and other          
Income taxes          
Total receivables 15,411 17,004    
Deferred income taxes - current         
Prepaid expenses and other assets          
Total current assets 15,411 17,004    
Property and equipment - at cost:        
Oil and natural gas properties and equipment 385,488 337,981    
Furniture, fixtures and other          
Total property and equipment 385,488 337,981    
Less accumulated depreciation, depletion and amortization 236,993 193,955    
Net property and equipment 148,495 144,026    
Restricted deposits for asset retirement obligations          
Deferred income taxes 8,689 13,509    
Other assets 434,660 393,499    
Total assets 607,255 568,038    
Current liabilities:        
Accounts payable   93    
Undistributed oil and natural gas proceeds 280 282    
Asset retirement obligations          
Accrued liabilities 126,199 116,132    
Total current liabilities 126,479 116,507    
Long-term debt          
Asset retirement obligations, less current portion 30,623 28,934    
Deferred income taxes          
Other liabilities          
Shareholders' equity:        
Common stock          
Additional paid-in capital 231,759 231,759    
Retained earnings 218,394 190,838    
Treasury stock, at cost          
Total shareholders’ equity 450,153 422,597    
Total liabilities and shareholders’ equity 607,255 568,038    
Eliminations
        
Current assets:        
Cash and cash equivalents          
Receivables:        
Oil and natural gas sales (31)       
Joint interest and other          
Income taxes (125,683) (115,866)    
Total receivables (125,714) (115,866)    
Deferred income taxes - current         
Prepaid expenses and other assets          
Total current assets (125,714) (115,866)    
Property and equipment - at cost:        
Oil and natural gas properties and equipment          
Furniture, fixtures and other          
Total property and equipment          
Less accumulated depreciation, depletion and amortization          
Net property and equipment          
Restricted deposits for asset retirement obligations          
Deferred income taxes (8,689) (13,509)    
Other assets (884,814) (816,096)    
Total assets (1,019,217) (945,471)    
Current liabilities:        
Accounts payable (31)       
Undistributed oil and natural gas proceeds          
Asset retirement obligations    35    
Accrued liabilities (125,683) (115,866)    
Total current liabilities (125,714) (115,831)    
Long-term debt          
Asset retirement obligations, less current portion    (35)    
Deferred income taxes (8,689) (13,509)    
Other liabilities (434,661) (393,499)    
Shareholders' equity:        
Common stock          
Additional paid-in capital (231,759) (231,759)    
Retained earnings (218,394) (190,838)    
Treasury stock, at cost          
Total shareholders’ equity (450,153) (422,597)    
Total liabilities and shareholders’ equity $ (1,019,217) $ (945,471)