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Segment Reporting - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Reconciliation of income from continuing operations from segments to consolidated [Abstract] |  |
Total consolidated operating income (loss) | $ 24,787 | $ 16,754
Interest expense | (7,954) | (9,332)
Gain (loss) on investments, net | 250 | (32)
Non-operating income (loss), net | 1,037 | 1,021
Income (loss) before income taxes | $ 18,120 | $ 8,411

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