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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement [Abstract]        
Revenues $ 398,810 $ 142,998 $ 696,929 $ 332,093
Cost of revenues (exclusive of items shown below) 254,016 126,997 470,258 288,253
Selling, general and administrative expenses 40,288 36,458 77,445 80,004
Depreciation and amortization 41,263 56,280 85,926 116,916
Gain on disposition of assets, net (3,759) (1,515) (5,276) (2,771)
Operating income (loss) 67,002 (75,222) 68,576 (150,309)
Interest expense (114) (126) (217) (451)
Interest income 411 104 540 127
Other income (expense), net 2,010 (154) 2,222 188
Income (loss) before income taxes 69,309 (75,398) 71,121 (150,445)
Income tax provision (benefit) 25,469 (26,712) 23,647 (69,248)
Net income (loss) $ 43,840 $ (48,686) $ 47,474 $ (81,197)
Earnings (loss) per share        
Basic (in dollars per share) $ 0.20 $ (0.23) $ 0.22 $ (0.38)
Diluted (in dollars per share) 0.20 (0.23) 0.22 (0.38)
Dividends per share (in dollars per share)