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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

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