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Industry Segments - Corporate Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
General and administrative expense | $ 33,617 | $ 29,460 | $ 64,420 | $ 56,211
Depreciation, amortization, and accretion | 28,979 | 25,784 | 55,420 | 52,308
Other (income) expense, net | 3,808 | 775 | 6,584 | 1,236
Warrants fair value adjustment |  |  | 201 | (11,521)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 12,132 | 7,966 | 33,189 | 12,211
Interest expense, net | 18,379 | 14,328 | 33,352 | 28,095
Corporate Overhead [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
General and administrative expense | 11,871 | 12,051 | 24,469 | 21,606
Depreciation, amortization, and accretion | 164 | 118 | 315 | 209
Other (income) expense, net | 220 | 305 | 370 | 733
Warrants fair value adjustment | 2,195 | (5,545) | 201 | (11,521)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 19,327 | 11,169 | 34,239 | 19,041
Interest expense, net | $ 4,877 | $ 4,240 | $ 8,884 | $ 8,014

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