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Segment Reporting - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of income from continuing operations from segments to consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total consolidated operating income (loss) | $ 26,994 | $ 28,329 | $ 21,169 | $ 16,754 | $ 18,110 | $ 9,475 | $ 8,252 | $ 10,673 | $ 93,246 | $ 46,510 | $ 22,526
Interest expense |  |  |  |  |  |  |  |  | (34,847) | (38,237) | (25,102)
Gain (loss) on investments, net |  |  |  |  |  |  |  |  | (275) | 564 | 271
Non-operating income (loss), net |  |  |  |  |  |  |  |  | 3,988 | 4,420 | 4,250
Income (loss) before income taxes |  |  |  |  |  |  |  |  | $ 62,112 | $ 13,257 | $ 1,945

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