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Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill |  |  |  |
Beginning balance |  | $ 18,932,000 | $ 81,752,000 |
Foreign currency translation impact |  | 853,000 | (1,524,000) |
Disposition |  |  | (154,000) |
Impairment charges | $ (128,938,000) | 0 | (61,142,000) | $ (80,337,000)
Ending balance |  | 19,785,000 | 18,932,000 | 81,752,000
Rail Products and Services |  |  |  |
Goodwill |  |  |  |
Beginning balance |  | 13,785,000 | 48,188,000 |
Foreign currency translation impact |  | 853,000 | (1,524,000) |
Disposition |  |  | (154,000) |
Impairment charges |  |  | (32,725,000) |
Ending balance |  | 14,638,000 | 13,785,000 | 48,188,000
Construction Products |  |  |  |
Goodwill |  |  |  |
Beginning balance |  | 5,147,000 | 5,147,000 |
Foreign currency translation impact |  | 0 | 0 |
Disposition |  |  | 0 |
Impairment charges |  |  | 0 |
Ending balance |  | 5,147,000 | 5,147,000 | 5,147,000
Tubular and Energy Services |  |  |  |
Goodwill |  |  |  |
Beginning balance |  | 0 | 28,417,000 |
Foreign currency translation impact |  | 0 | 0 |
Disposition |  |  | 0 |
Impairment charges |  |  | (28,417,000) |
Ending balance |  | $ 0 | $ 0 | $ 28,417,000

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