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Industry Segments - Corporate Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
General and administrative expense | $ 30,803 | $ 26,751
Depreciation, amortization, and accretion | 26,441 | 26,524
Other (income) expense, net | 2,776 | 461
Warrants fair value adjustment | (1,995) | (5,976)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 21,057 | 4,245
Interest expense, net | 14,973 | 13,767
Corporate Overhead [Member] |  |
Segment Reporting Information [Line Items] |  |
General and administrative expense | 12,598 | 9,555
Depreciation, amortization, and accretion | 151 | 91
Other (income) expense, net | 150 | 428
Warrants fair value adjustment | (1,994) | (5,976)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 14,912 | 7,872
Interest expense, net | $ 4,007 | $ 3,774

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