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Industry Segments - Corporate Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
General and administrative expense | $ 34,446 | $ 29,685 | $ 98,866 | $ 85,896
Depreciation, amortization, and accretion | 29,460 | 25,942 | 84,880 | 78,250
Other (income) expense, net | 619 | (425) | 7,203 | 811
Warrants fair value adjustment |  |  | 22 | (11,568)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 12,852 | 857 | 46,041 | 13,068
Interest expense, net | 18,894 | 14,654 | 52,246 | 42,749
Corporate Overhead [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
General and administrative expense | 13,037 | 12,277 | 37,506 | 33,883
Depreciation, amortization, and accretion | 172 | 129 | 487 | 338
Other (income) expense, net | 1,333 | 293 | 1,703 | 1,026
Warrants fair value adjustment | (179) | (47) | 22 | (11,568)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 19,631 | 16,551 | 53,870 | 35,592
Interest expense, net | $ 5,268 | $ 3,899 | $ 14,152 | $ 11,913

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