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Guarantor Subsidiaries (Consolidating Balance Sheet) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Current assets        
Cash and cash equivalents $ 254,210 $ 102,335 $ 120,469  
Accounts receivable—trade, less allowance for doubtful accounts of $1,988 in 2016 148,211 136,253    
Inventories, at lower of cost or market 152,494 155,906    
Prepaid expenses and other current assets 17,066 41,173    
Total current assets 571,981 435,667    
Property, plant and equipment, at cost less accumulated depreciation and amortization of $732,114 in 2016 1,430,816 1,369,318    
Restricted cash 53,853 68,571    
Investments in subsidiaries 0 0    
Other assets 27,196 12,685    
Total assets 2,083,846 1,886,241    
Current liabilities        
Current maturities of long-term debt 30,372 222    
Inter-company accounts payable 0 0    
Trade accounts payable and accrued liabilities 401,141 390,341    
Income taxes payable 24,184 0    
Deferred income taxes 0 1,729    
Total current liabilities 455,697 392,292    
Long-term debt, including capitalized lease obligations 648,266 490,160    
Deferred income taxes 177,570 161,236    
Asset retirement obligations 25,012 24,345    
Deferred credits and other liabilities 19,389 25,918    
Total liabilities 1,325,934 1,093,951    
Stockholders' Equity        
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) 0 0    
Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at June 30, 2016) 468 468    
Treasury Stock (7,603,706 shares held at June 30, 2016) (454,496) (294,139)    
Additional paid in capital (APIC) 551,977 558,182    
Retained earnings 659,963 527,779    
Total stockholders' equity 757,912 792,290 719,317 $ 858,705
Total liabilities and stockholders' equity 2,083,846 1,886,241    
Eliminations        
Current assets        
Cash and cash equivalents 0 0 0  
Accounts receivable—trade, less allowance for doubtful accounts of $1,988 in 2016 0 0    
Inventories, at lower of cost or market 0 0    
Prepaid expenses and other current assets 0 0    
Total current assets 0 0    
Property, plant and equipment, at cost less accumulated depreciation and amortization of $732,114 in 2016 0 0    
Restricted cash 0 0    
Investments in subsidiaries (2,033,721) (1,901,538)    
Other assets 0 0    
Total assets (2,033,721) (1,901,538)    
Current liabilities        
Current maturities of long-term debt 0 0    
Inter-company accounts payable 0 0    
Trade accounts payable and accrued liabilities 0 0    
Income taxes payable 0 0    
Deferred income taxes 0 0    
Total current liabilities 0 0    
Long-term debt, including capitalized lease obligations 0 0    
Deferred income taxes 0    
Asset retirement obligations 0 0    
Deferred credits and other liabilities 0 0    
Total liabilities 0 0    
Stockholders' Equity        
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) 0 0    
Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at June 30, 2016) (61) (61)    
Treasury Stock (7,603,706 shares held at June 30, 2016) 0 0    
Additional paid in capital (APIC) (1,368,384) (1,368,384)    
Retained earnings (665,276) (533,093)    
Total stockholders' equity (2,033,721) (1,901,538)    
Total liabilities and stockholders' equity (2,033,721) (1,901,538)    
Parent Company        
Current assets        
Cash and cash equivalents 0 0 0  
Accounts receivable—trade, less allowance for doubtful accounts of $1,988 in 2016 0 0    
Inventories, at lower of cost or market 0 0    
Prepaid expenses and other current assets 0 0    
Total current assets 0 0    
Property, plant and equipment, at cost less accumulated depreciation and amortization of $732,114 in 2016 0 0    
Restricted cash 0 0    
Investments in subsidiaries 1,888,801 1,756,617    
Other assets 0 0    
Total assets 1,888,801 1,756,617    
Current liabilities        
Current maturities of long-term debt 0 0    
Inter-company accounts payable 467,148 300,044    
Trade accounts payable and accrued liabilities 0 0    
Income taxes payable 0 0    
Deferred income taxes 0 0    
Total current liabilities 467,148 300,044    
Long-term debt, including capitalized lease obligations 0 0    
Deferred income taxes 0 0    
Asset retirement obligations 0 0    
Deferred credits and other liabilities 0 0    
Total liabilities 467,148 300,044    
Stockholders' Equity        
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) 0 0    
Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at June 30, 2016) 468 468    
Treasury Stock (7,603,706 shares held at June 30, 2016) (454,496) (294,139)    
Additional paid in capital (APIC) 1,215,718 1,222,465    
Retained earnings 659,963 527,779    
Total stockholders' equity 1,421,653 1,456,573    
Total liabilities and stockholders' equity 1,888,801 1,756,617    
Issuer        
Current assets        
Cash and cash equivalents 254,210 102,335 120,469  
Accounts receivable—trade, less allowance for doubtful accounts of $1,988 in 2016 148,211 136,253    
Inventories, at lower of cost or market 152,494 155,906    
Prepaid expenses and other current assets 17,066 41,173    
Total current assets 571,981 435,667    
Property, plant and equipment, at cost less accumulated depreciation and amortization of $732,114 in 2016 1,430,816 1,369,318    
Restricted cash 53,853 68,571    
Investments in subsidiaries 144,920 144,921    
Other assets 27,196 12,685    
Total assets 2,228,766 2,031,162    
Current liabilities        
Current maturities of long-term debt 30,372 222    
Inter-company accounts payable (260,735) (93,644)    
Trade accounts payable and accrued liabilities 401,141 390,341    
Income taxes payable 24,170 0    
Deferred income taxes 0 1,729    
Total current liabilities 194,948 298,648    
Long-term debt, including capitalized lease obligations 648,266 490,160    
Deferred income taxes 177,570 161,236    
Asset retirement obligations 25,012 24,345    
Deferred credits and other liabilities 19,389 25,918    
Total liabilities 1,065,185 1,000,307    
Stockholders' Equity        
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) 0 0    
Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at June 30, 2016) 1 1    
Treasury Stock (7,603,706 shares held at June 30, 2016) 0 0    
Additional paid in capital (APIC) 565,096 564,554    
Retained earnings 598,484 466,300    
Total stockholders' equity 1,163,581 1,030,855    
Total liabilities and stockholders' equity 2,228,766 2,031,162    
Guarantor Subsidiaries        
Current assets        
Cash and cash equivalents 0 0 0  
Accounts receivable—trade, less allowance for doubtful accounts of $1,988 in 2016 0 0    
Inventories, at lower of cost or market 0 0    
Prepaid expenses and other current assets 0 0    
Total current assets 0 0    
Property, plant and equipment, at cost less accumulated depreciation and amortization of $732,114 in 2016 0 0    
Restricted cash 0 0    
Investments in subsidiaries 0 0    
Other assets 0 0    
Total assets 0 0    
Current liabilities        
Current maturities of long-term debt 0 0    
Inter-company accounts payable (52,075) (52,062)    
Trade accounts payable and accrued liabilities 0 0    
Income taxes payable 14 0    
Deferred income taxes 0 0    
Total current liabilities (52,061) (52,062)    
Long-term debt, including capitalized lease obligations 0 0    
Deferred income taxes 0 0    
Asset retirement obligations 0 0    
Deferred credits and other liabilities 0 0    
Total liabilities (52,061) (52,062)    
Stockholders' Equity        
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) 0 0    
Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at June 30, 2016) 60 60    
Treasury Stock (7,603,706 shares held at June 30, 2016) 0 0    
Additional paid in capital (APIC) 52,004 52,004    
Retained earnings (3) (2)    
Total stockholders' equity 52,061 52,062    
Total liabilities and stockholders' equity 0 0    
Non-Guarantor Subsidiaries        
Current assets        
Cash and cash equivalents 0 0 $ 0  
Accounts receivable—trade, less allowance for doubtful accounts of $1,988 in 2016 0 0    
Inventories, at lower of cost or market 0 0    
Prepaid expenses and other current assets 0 0    
Total current assets 0 0    
Property, plant and equipment, at cost less accumulated depreciation and amortization of $732,114 in 2016 0 0    
Restricted cash 0 0    
Investments in subsidiaries 0 0    
Other assets 0 0    
Total assets 0 0    
Current liabilities        
Current maturities of long-term debt 0 0    
Inter-company accounts payable (154,338) (154,338)    
Trade accounts payable and accrued liabilities 0 0    
Income taxes payable 0 0    
Deferred income taxes 0 0    
Total current liabilities (154,338) (154,338)    
Long-term debt, including capitalized lease obligations 0 0    
Deferred income taxes 0 0    
Asset retirement obligations 0 0    
Deferred credits and other liabilities 0 0    
Total liabilities (154,338) (154,338)    
Stockholders' Equity        
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) 0 0    
Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at June 30, 2016) 0 0    
Treasury Stock (7,603,706 shares held at June 30, 2016) 0 0    
Additional paid in capital (APIC) 87,543 87,543    
Retained earnings 66,795 66,795    
Total stockholders' equity 154,338 154,338    
Total liabilities and stockholders' equity $ 0 $ 0