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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement [Abstract]        
Revenues $ 856,396 $ 564,245 $ 1,621,835 $ 1,169,498
Operating expenses        
Cost of revenues (excluding depreciation) 747,924 474,353 1,409,823 975,642
Operating expense (excluding depreciation) 53,060 51,675 104,070 102,023
Depreciation, depletion, and amortization 12,775 11,284 25,812 22,544
General and administrative expense (excluding depreciation) 12,905 10,482 24,110 23,396
Acquisition and integration expense 749 0 1,381 253
Total operating expenses 827,413 547,794 1,565,196 1,123,858
Operating income 28,983 16,451 56,639 45,640
Other income (expense)        
Interest expense and financing costs, net (10,544) (9,139) (18,921) (18,081)
Loss on termination of financing agreements 0 (1,804) 0 (1,804)
Other income, net 657 107 776 237
Change in value of common stock warrants (74) (547) 671 (1,236)
Change in value of contingent consideration 0 0 (10,500) 0
Equity earnings (losses) from Laramie Energy, LLC (2,352) 2,352 3,224 11,098
Total other income (expense), net (12,313) (9,031) (24,750) (9,786)
Income before income taxes 16,670 7,420 31,889 35,854
Income tax expense (492) (414) (526) (1,062)
Net income $ 16,178 $ 7,006 $ 31,363 $ 34,792
Income per share        
Basic (USD per share) $ 0.35 $ 0.15 $ 0.68 $ 0.76
Diluted (USD per share) $ 0.35 $ 0.15 $ 0.68 $ 0.75
Weighted-average number of shares outstanding        
Basic (in shares) 45,684 45,541 45,659 45,505
Diluted (in shares) 45,723 45,564 45,700 45,536