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Consolidated Balance Sheets - 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 and $1,963 in 2015 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 and $724,486 in 2015 1,430,816 1,369,318    
Restricted cash 53,853 68,571    
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    
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 and 46,767,164 shares issued at 2016 and 2015, respectively) 468 468    
Treasury stock (7,603,706 and 5,088,434 shares held at June 30, 2016 and December 31, 2015, respectively) (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