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Segment Information (Reconciliation of Assets from Segment to Consolidated) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total Operating Assets | $ 304,106 | $ 285,643
Consolidated income taxes receivable | 329 | 815
Consolidated deferred income taxes, long-term | 11,428 | 9,446
Consolidated income taxes receivable, long-term | 1,767 |
Total assets | 317,630 | 295,904
Manufacturing [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Operating Assets | 166,284 | 136,448
Corporate and Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Operating Assets | $ 137,822 | $ 149,195

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