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Disposition of Assets (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |  |
Loss from discontinued operation, net of income taxes | $ (504) | $ (81) |  |
From discontinued operation (in US dollars per share) | $ (0.01) | $ 0.00 |  |
Restructuring reserve | $ 236 | $ 172 | $ 201 | $ 81
UNITED KINGDOM | Discontinued Operations [Member] | United Kingdom Construction [Member] |  |  |  |
Income Statement [Abstract] |  |  |  |
Revenues | 0 | 63 |  |
Loss from discontinued operation, net of income taxes | $ (504) | $ (81) |  |
From discontinued operation (in US dollars per share) | $ (0.01) | $ 0.00 |  |
Assets of discontinued operation: |  |  |  |
Current assets | $ 935 |  | 1,233 |
Liabilities of discontinued operation: |  |  |  |
Current liabilities | 3,932 |  | $ 4,036 |
Employee Severance [Member] | UNITED KINGDOM | Discontinued Operations [Member] | United Kingdom Construction [Member] |  |  |  |
Income Statement [Abstract] |  |  |  |
Restructuring reserve | $ 100 |  |  |

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