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Consolidated Balance Sheets - 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    
Other assets 12,685 10,543    
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    
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