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Business Segments (Reconciliation of Operating Profit (Loss) from Segments to Consolidated) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting [Abstract] |  |  |  |
Profit for reportable segments | $ 7,495 | $ 11,176 | $ 32,847 | $ 27,837
Interest expense - net | (1,079) | (1,296) | (4,031) | (4,813)
Other income (expense) - net | 421 | (157) | 823 | 320
Unallocated corporate expenses and other unallocated charges | (3,722) | (3,297) | (10,947) | (12,089)
Income before income taxes | $ 3,115 | $ 6,426 | $ 18,692 | $ 11,255

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