Quarterly report pursuant to Section 13 or 15(d)

Supplemental Guarantor Information - Condensed Consolidating Balance Sheet (Details)

v2.4.0.8
Supplemental Guarantor Information - Condensed Consolidating Balance Sheet (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Current assets:        
Cash and cash equivalents $ 17,220 $ 15,800 $ 15,227 $ 12,245
Receivables:        
Oil and natural gas sales 97,688 96,752    
Joint interest and other 32,785 27,984    
Income taxes 120 3,120    
Total receivables 130,593 127,856    
Prepaid expenses and other assets 32,555 29,946    
Total current assets 180,368 173,602    
Property and equipment - at cost:        
Oil and natural gas properties and equipment 7,865,702 7,339,097    
Furniture, fixtures and other 22,128 21,431    
Total property and equipment 7,887,830 7,360,528    
Less accumulated depreciation, depletion and amortization 5,449,545 5,084,704    
Net property and equipment 2,438,285 2,275,824    
Restricted deposits for asset retirement obligations 15,382 37,421    
Other assets 17,989 20,455    
Total assets 2,652,024 2,507,302    
Current liabilities:        
Accounts payable 159,621 145,212    
Undistributed oil and natural gas proceeds 37,821 42,107    
Asset retirement obligations 115,722 77,785    
Accrued liabilities 39,030 28,000    
Total current liabilities 352,194 293,104    
Long-term debt, less current maturities 1,260,665 1,205,421    
Asset retirement obligations, less current portion 288,280 276,637    
Deferred income taxes 187,057 178,142    
Other liabilities 13,634 13,388    
Shareholders' equity:        
Common stock 1 1    
Additional paid-in capital 414,430 403,564    
Retained earnings 159,930 161,212    
Treasury stock, at cost (24,167) (24,167)    
Total shareholders' equity 550,194 540,610    
Total liabilities and shareholders' equity 2,652,024 2,507,302    
Eliminations
        
Receivables:        
Income taxes (136,269) (92,491)    
Total receivables (136,269) (92,491)    
Total current assets (136,269) (92,491)    
Property and equipment - at cost:        
Other assets (1,401,644) (1,410,568)    
Total assets (1,537,913) (1,503,059)    
Current liabilities:        
Accrued liabilities (136,269) (92,491)    
Total current liabilities (136,269) (92,491)    
Other liabilities (455,044) (427,621)    
Shareholders' equity:        
Additional paid-in capital (699,815) (784,104)    
Retained earnings (246,785) (198,843)    
Total shareholders' equity (946,600) (982,947)    
Total liabilities and shareholders' equity (1,537,913) (1,503,059)    
Parent Company
        
Current assets:        
Cash and cash equivalents 17,220 15,800 15,227 12,245
Receivables:        
Oil and natural gas sales 52,332 61,373    
Joint interest and other 32,785 27,984    
Income taxes 136,389 95,611    
Total receivables 221,506 184,968    
Prepaid expenses and other assets 29,364 23,674    
Total current assets 268,090 224,442    
Property and equipment - at cost:        
Oil and natural gas properties and equipment 5,970,031 5,667,389    
Furniture, fixtures and other 22,128 21,431    
Total property and equipment 5,992,159 5,688,820    
Less accumulated depreciation, depletion and amortization 4,366,703 4,166,359    
Net property and equipment 1,625,456 1,522,461    
Restricted deposits for asset retirement obligations 15,382 37,421    
Other assets 979,751 951,203    
Total assets 2,888,679 2,735,527    
Current liabilities:        
Accounts payable 153,928 144,492    
Undistributed oil and natural gas proceeds 37,501 41,735    
Asset retirement obligations 109,223 65,329    
Accrued liabilities 39,313 28,000    
Total current liabilities 339,965 279,556    
Long-term debt, less current maturities 1,260,665 1,205,421    
Asset retirement obligations, less current portion 175,135 189,507    
Deferred income taxes 94,042 79,424    
Other liabilities 468,678 441,009    
Shareholders' equity:        
Common stock 1 1    
Additional paid-in capital 414,430 403,564    
Retained earnings 159,930 161,212    
Treasury stock, at cost (24,167) (24,167)    
Total shareholders' equity 550,194 540,610    
Total liabilities and shareholders' equity 2,888,679 2,735,527    
Guarantor Subsidiaries
        
Receivables:        
Oil and natural gas sales 45,356 35,379    
Total receivables 45,356 35,379    
Prepaid expenses and other assets 3,191 6,272    
Total current assets 48,547 41,651    
Property and equipment - at cost:        
Oil and natural gas properties and equipment 1,895,671 1,671,708    
Total property and equipment 1,895,671 1,671,708    
Less accumulated depreciation, depletion and amortization 1,082,842 918,345    
Net property and equipment 812,829 753,363    
Other assets 439,882 479,820    
Total assets 1,301,258 1,274,834    
Current liabilities:        
Accounts payable 5,693 720    
Undistributed oil and natural gas proceeds 320 372    
Asset retirement obligations 6,499 12,456    
Accrued liabilities 135,986 92,491    
Total current liabilities 148,498 106,039    
Asset retirement obligations, less current portion 113,145 87,130    
Deferred income taxes 93,015 98,718    
Shareholders' equity:        
Additional paid-in capital 699,815 784,104    
Retained earnings 246,785 198,843    
Total shareholders' equity 946,600 982,947    
Total liabilities and shareholders' equity $ 1,301,258 $ 1,274,834