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Business Segments (Reconciliation of Operating Profit (Loss) from Segments to Consolidated) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting [Abstract] |  |  |  |
Profit for reportable segments | $ 16,351 | $ 12,710 | $ 25,352 | $ 16,661
Interest expense - net | 1,597 | 1,630 | 2,952 | 3,517
Other income (expense) | 252 | (128) | 402 | 477
Unallocated corporate expenses and other unallocated charges | (3,757) | (4,790) | (7,225) | (8,792)
Income before income taxes | $ 11,249 | $ 6,162 | $ 15,577 | $ 4,829

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