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Disposition Of Assets (Components Of The Results Of Discontinued Operations For The UK Construction Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |
Loss from discontinued operation, net of income taxes |  |  |  |  |  |  |  |  | $ (857) | $ (3,142) | $ (60)
Diluted loss per share from discontinued operation (in US dollars per share) | $ 0.00 | $ 0.00 | $ 0.00 | $ (0.01) | $ (0.03) | $ (0.01) | $ (0.02) | $ 0.00 | $ (0.01) | $ (0.05) | $ 0.00
Restructuring reserve | $ 492 |  |  |  | $ 201 |  |  |  | $ 492 | $ 201 | $ 81
United Kingdom Construction |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 863 | 345 | 3,823
Loss from discontinued operation, net of income taxes |  |  |  |  |  |  |  |  | $ (857) | $ (3,142) | $ (60)
Diluted loss per share from discontinued operation (in US dollars per share) |  |  |  |  |  |  |  |  | $ (0.01) | $ (0.05) | $ 0.00
Restructuring reserve | 100 |  |  |  |  |  |  |  | $ 100 |  |
Assets of discontinued operation: |  |  |  |  |  |  |  |  |  |  |
Current assets | 242 |  |  |  | 1,233 |  |  |  | 242 | $ 1,233 |
Liabilities of discontinued operation: |  |  |  |  |  |  |  |  |  |  |
Current liabilities | $ 2,811 |  |  |  | $ 4,036 |  |  |  | $ 2,811 | $ 4,036 |

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