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Disposition of Assets (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement [Abstract] |  |  |  |  |  |
Loss from discontinued operation, net of income taxes | $ (523) | $ (207) | $ (1,010) | $ (729) |  |
From discontinued operation (in US dollars per share) | $ (0.01) | $ 0.00 | $ (0.02) | $ (0.01) |  |
Restructuring reserve | $ 209 | $ 49 | $ 209 | $ 49 | $ 492 | $ 201
UNITED KINGDOM | Discontinued Operations [Member] | United Kingdom Construction [Member] |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Revenues | 0 | (81) | 0 | 863 |  |
Loss from discontinued operation, net of income taxes | $ (523) | $ (207) | $ (1,010) | $ (729) |  |
From discontinued operation (in US dollars per share) | $ (0.01) | $ 0.00 | $ (0.02) | $ (0.01) |  |
Assets of discontinued operation: |  |  |  |  |  |
Current assets | $ 100 |  | $ 100 |  | 242 |
Liabilities of discontinued operation: |  |  |  |  |  |
Current liabilities | 2,252 |  | 2,252 |  | $ 2,811 |
Employee Severance [Member] | UNITED KINGDOM | Discontinued Operations [Member] | United Kingdom Construction [Member] |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Restructuring reserve | $ 100 |  | $ 100 |  |  |

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