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Industry Segments - Corporate Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
General and administrative expense | $ 31,232 | $ 27,181 | $ 59,688 | $ 60,792
Depreciation, amortization, and accretion | 28,620 | 33,538 | 58,098 | 67,145
Other (income) expense, net | 209 | 2,210 | 574 | 1,506
Warrants fair value adjustment |  |  | (11,521) | 0
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 11,216 | 27,454 | 22,378 | 176,594
Interest expense, net | 14,328 | 14,335 | 28,095 | 28,974
Corporate Overhead [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
General and administrative expense | 12,051 | 8,021 | 21,606 | 17,950
Depreciation, amortization, and accretion | 118 | 112 | 209 | 226
Other (income) expense, net | 305 | 2,450 | 733 | 2,740
Warrants fair value adjustment | (5,545) | 0 | (11,521) | 0
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 11,169 | 16,179 | 19,041 | 32,563
Interest expense, net | $ 4,240 | $ 5,596 | $ 8,014 | $ 11,647

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