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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement [Abstract]        
Revenues $ 909,781 $ 610,506 $ 2,531,616 $ 1,780,004
Operating expenses        
Cost of revenues (excluding depreciation) 822,785 509,476 2,232,608 1,485,118
Operating expense (excluding depreciation) 54,905 51,718 158,975 153,741
Depreciation, depletion, and amortization 13,192 11,304 39,004 33,848
General and administrative expense (excluding depreciation) 11,871 11,292 35,981 34,688
Acquisition and integration expense 2,134 0 3,515 253
Total operating expenses 904,887 583,790 2,470,083 1,707,648
Operating income 4,894 26,716 61,533 72,356
Other income (expense)        
Interest expense and financing costs, net (10,425) (7,419) (29,346) (25,500)
Loss on termination of financing agreements 0 0 0 (1,804)
Other income, net 85 649 861 886
Change in value of common stock warrants (1,067) (975) (396) (2,211)
Change in value of contingent consideration 0 0 (10,500) 0
Equity earnings from Laramie Energy, LLC 1,050 553 4,274 11,651
Total other income (expense), net (10,357) (7,192) (35,107) (16,978)
Income (loss) before income taxes (5,463) 19,524 26,426 55,378
Income tax expense (359) (700) (885) (1,762)
Net income (loss) $ (5,822) $ 18,824 $ 25,541 $ 53,616
Income (loss) per share        
Basic (USD per share) $ (0.13) $ 0.41 $ 0.55 $ 1.16
Diluted (USD per share) $ (0.13) $ 0.41 $ 0.55 $ 1.16
Weighted-average number of shares outstanding        
Basic (in shares) 45,709 45,561 45,676 45,505
Diluted (in shares) 45,709 51,992 45,721 45,527