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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
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of income from continuing operations from segments to consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total consolidated operating income | $ 22,880 | $ 25,359 | $ 24,020 | $ 24,787 | $ 26,994 | $ 28,329 | $ 21,169 | $ 16,754 | $ 97,046 | $ 93,246 | $ 46,510
Interest expense |  |  |  |  |  |  |  |  | (29,468) | (34,847) | (38,237)
Other |  |  |  |  |  |  |  |  | 3,461 | 3,713 | 4,984
Income before income taxes |  |  |  |  |  |  |  |  | $ 71,039 | $ 62,112 | $ 13,257

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