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Industry Segments - Corporate Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
General and administrative expense | $ 34,277 | $ 30,803
Depreciation, amortization, and accretion | 30,628 | 26,441
Other (income) expense, net | (951) | 2,776
Fair Value Adjustment of Warrants | 407 | (1,994)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 18,674 | 21,057
Interest expense, net | 18,379 | 14,973
Corporate Overhead [Member] |  |
Segment Reporting Information [Line Items] |  |
General and administrative expense | 12,089 | 12,598
Depreciation, amortization, and accretion | 168 | 151
Other (income) expense, net | (319) | 150
Fair Value Adjustment of Warrants | 407 | (1,994)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 17,687 | 14,912
Interest expense, net | $ 5,342 | $ 4,007

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