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Guarantor Subsidiaries (Consolidating Balance Sheet) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current assets        
Cash and cash equivalents $ 102,335 $ 327,163 $ 294,741  
Accounts receivable—trade, less allowance for doubtful accounts of $1,963 in 2015 and $4,456 in 2014 136,253 138,466    
Inventories, at lower of cost or market 155,906 157,046    
Prepaid expenses and other current assets 41,173 11,710    
Current assets held for sale 0 56,328    
Total current assets 435,667 690,713    
Property, plant and equipment, at cost less accumulated depreciation and amortization of $724,486 in 2015 and $663,067 in 2014 1,369,318 1,248,081    
Restricted cash 68,571 0    
Investments in subsidiaries 0 0    
Other assets 12,685 10,543    
Deferred tax assets 0 0    
Noncurrent assets held for sale 0 0    
Total assets 1,886,241 1,949,337 1,888,564  
Current liabilities        
Current maturities of long-term debt 222 0    
Inter-company accounts payable 0 0    
Trade accounts payable and accrued liabilities 390,341 381,271    
Income taxes payable 0 18,362    
Deferred income taxes 1,729 522    
Current liabilities held for sale 0 12,925    
Total current liabilities 392,292 413,080    
Long-term debt, including capitalized lease obligations 490,160 488,250    
Deferred income taxes 161,236 137,882    
Asset retirement obligations 24,345 22,245    
Deferred credits and other liabilities 25,918 29,175    
Total liabilities 1,093,951 1,090,632    
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 issued and 46,767,164 shares issued and outstanding at 2015 and 2014, respectively) 468 468    
Treasury stock (5,088,434 and 1,056,689 shares held at December 31, 2015 and December 31, 2014, respectively) (294,139) (51,073)    
Additional paid in capital (APIC) 558,182 557,871    
Retained earnings 527,779 351,439    
Total stockholders' equity 792,290 858,705 656,336 $ 1,104,451
Total liabilities and stockholders' equity 1,886,241 1,949,337    
Eliminations [Member]        
Current assets        
Cash and cash equivalents 0 0 0  
Accounts receivable—trade, less allowance for doubtful accounts of $1,963 in 2015 and $4,456 in 2014 0 0    
Inventories, at lower of cost or market 0 0    
Prepaid expenses and other current assets 0 0    
Current assets held for sale 0 0    
Total current assets 0 0    
Property, plant and equipment, at cost less accumulated depreciation and amortization of $724,486 in 2015 and $663,067 in 2014 0 0    
Restricted cash 0      
Investments in subsidiaries (1,901,538) (1,757,540)    
Other assets 0 0    
Deferred tax assets 0 0    
Noncurrent assets held for sale 0 0    
Total assets (1,901,538) (1,757,540)    
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    
Current liabilities held for sale 0 0    
Total current liabilities 0 0    
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 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 issued and 46,767,164 shares issued and outstanding at 2015 and 2014, respectively) (61) (61)    
Treasury stock (5,088,434 and 1,056,689 shares held at December 31, 2015 and December 31, 2014, respectively) 0 0    
Additional paid in capital (APIC) (1,368,384) (1,316,516)    
Retained earnings (533,093) (440,963)    
Total stockholders' equity (1,901,538) (1,757,540)    
Total liabilities and stockholders' equity (1,901,538) (1,757,540)    
Parent Company [Member]        
Current assets        
Cash and cash equivalents 0 0 0  
Accounts receivable—trade, less allowance for doubtful accounts of $1,963 in 2015 and $4,456 in 2014 0 0    
Inventories, at lower of cost or market 0 0    
Prepaid expenses and other current assets 0 0    
Current assets held for sale 0 0    
Total current assets 0 0    
Property, plant and equipment, at cost less accumulated depreciation and amortization of $724,486 in 2015 and $663,067 in 2014 0 0    
Restricted cash 0      
Investments in subsidiaries 1,756,617 1,580,277    
Other assets 0 0    
Deferred tax assets 0 0    
Noncurrent assets held for sale 0 0    
Total assets 1,756,617 1,580,277    
Current liabilities        
Current maturities of long-term debt 0 0    
Inter-company accounts payable 300,044 51,348    
Trade accounts payable and accrued liabilities 0 0    
Income taxes payable 0 0    
Deferred income taxes 0 0    
Current liabilities held for sale 0 0    
Total current liabilities 300,044 51,348    
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 300,044 51,348    
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 issued and 46,767,164 shares issued and outstanding at 2015 and 2014, respectively) 468 468    
Treasury stock (5,088,434 and 1,056,689 shares held at December 31, 2015 and December 31, 2014, respectively) (294,139) (51,073)    
Additional paid in capital (APIC) 1,222,465 1,228,095    
Retained earnings 527,779 351,439    
Total stockholders' equity 1,456,573 1,528,929    
Total liabilities and stockholders' equity 1,756,617 1,580,277    
Issuer [Member]        
Current assets        
Cash and cash equivalents 102,335 327,163 294,741  
Accounts receivable—trade, less allowance for doubtful accounts of $1,963 in 2015 and $4,456 in 2014 136,253 138,466    
Inventories, at lower of cost or market 155,906 157,046    
Prepaid expenses and other current assets 41,173 11,710    
Current assets held for sale 0 0    
Total current assets 435,667 634,385    
Property, plant and equipment, at cost less accumulated depreciation and amortization of $724,486 in 2015 and $663,067 in 2014 1,369,318 1,248,081    
Restricted cash 68,571      
Investments in subsidiaries 144,921 177,263    
Other assets 12,685 10,543    
Deferred tax assets 0 0    
Noncurrent assets held for sale 0 0    
Total assets 2,031,162 2,070,272    
Current liabilities        
Current maturities of long-term debt 222 0    
Inter-company accounts payable (93,644) 82,528    
Trade accounts payable and accrued liabilities 390,341 381,271    
Income taxes payable 0 18,348    
Deferred income taxes 1,729 522    
Current liabilities held for sale 0 0    
Total current liabilities 298,648 482,669    
Long-term debt, including capitalized lease obligations 490,160 488,250    
Deferred income taxes 161,236 137,882    
Asset retirement obligations 24,345 22,245    
Deferred credits and other liabilities 25,918 29,175    
Total liabilities 1,000,307 1,160,221    
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 issued and 46,767,164 shares issued and outstanding at 2015 and 2014, respectively) 1 1    
Treasury stock (5,088,434 and 1,056,689 shares held at December 31, 2015 and December 31, 2014, respectively) 0 0    
Additional paid in capital (APIC) 564,554 558,611    
Retained earnings 466,300 351,439    
Total stockholders' equity 1,030,855 910,051    
Total liabilities and stockholders' equity 2,031,162 2,070,272    
Guarantor Subsidiaries [Member]        
Current assets        
Cash and cash equivalents 0 0 0  
Accounts receivable—trade, less allowance for doubtful accounts of $1,963 in 2015 and $4,456 in 2014 0 0    
Inventories, at lower of cost or market 0 0    
Prepaid expenses and other current assets 0 0    
Current assets held for sale 0 0    
Total current assets 0 0    
Property, plant and equipment, at cost less accumulated depreciation and amortization of $724,486 in 2015 and $663,067 in 2014 0 0    
Restricted cash 0      
Investments in subsidiaries 0 0    
Other assets 0 0    
Deferred tax assets 0 0    
Noncurrent assets held for sale 0 0    
Total assets 0 0    
Current liabilities        
Current maturities of long-term debt 0 0    
Inter-company accounts payable (52,062) (52,077)    
Trade accounts payable and accrued liabilities 0 0    
Income taxes payable 0 14    
Deferred income taxes 0 0    
Current liabilities held for sale 0 0    
Total current liabilities (52,062) (52,063)    
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 (52,062) (52,063)    
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 issued and 46,767,164 shares issued and outstanding at 2015 and 2014, respectively) 60 60    
Treasury stock (5,088,434 and 1,056,689 shares held at December 31, 2015 and December 31, 2014, respectively) 0 0    
Additional paid in capital (APIC) 52,004 52,004    
Retained earnings (2) (1)    
Total stockholders' equity 52,062 52,063    
Total liabilities and stockholders' equity 0 0    
Non-Guarantor Subsidiaries [Member]        
Current assets        
Cash and cash equivalents 0 0 $ 0  
Accounts receivable—trade, less allowance for doubtful accounts of $1,963 in 2015 and $4,456 in 2014 0 0    
Inventories, at lower of cost or market 0 0    
Prepaid expenses and other current assets 0 0    
Current assets held for sale 0 56,328    
Total current assets 0 56,328    
Property, plant and equipment, at cost less accumulated depreciation and amortization of $724,486 in 2015 and $663,067 in 2014 0 0    
Restricted cash 0      
Investments in subsidiaries 0 0    
Other assets 0 0    
Deferred tax assets 0 0    
Noncurrent assets held for sale 0 0    
Total assets 0 56,328    
Current liabilities        
Current maturities of long-term debt 0 0    
Inter-company accounts payable (154,338) (81,799)    
Trade accounts payable and accrued liabilities 0 0    
Income taxes payable 0 0    
Deferred income taxes 0 0    
Current liabilities held for sale 0 12,925    
Total current liabilities (154,338) (68,874)    
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) (68,874)    
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 issued and 46,767,164 shares issued and outstanding at 2015 and 2014, respectively) 0 0    
Treasury stock (5,088,434 and 1,056,689 shares held at December 31, 2015 and December 31, 2014, respectively) 0 0    
Additional paid in capital (APIC) 87,543 35,677    
Retained earnings 66,795 89,525    
Total stockholders' equity 154,338 125,202    
Total liabilities and stockholders' equity $ 0 $ 56,328