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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Revenues $ 765,439 $ 605,253
Operating expenses    
Cost of revenues (excluding depreciation) 661,899 501,289
Operating expense (excluding depreciation) 51,010 50,348
Depreciation, depletion, and amortization 13,037 11,260
General and administrative expense (excluding depreciation) 11,205 12,914
Acquisition and integration expense 632 253
Total operating expenses 737,783 576,064
Operating income 27,656 29,189
Other income (expense)    
Interest expense and financing costs, net (8,377) (8,942)
Other income, net 119 130
Change in value of common stock warrants 745 (689)
Change in value of contingent consideration (10,500) 0
Equity earnings from Laramie Energy, LLC 5,576 8,746
Total other income (expense), net (12,437) (755)
Income before income taxes 15,219 28,434
Income tax expense (34) (648)
Net income $ 15,185 $ 27,786
Income per share    
Basic (USD per share) $ 0.33 $ 0.60
Diluted (USD per share) $ 0.33 $ 0.58
Weighted-average number of shares outstanding    
Basic (in shares) 45,634 45,476
Diluted (in shares) 45,677 51,865