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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |
Loss from discontinued operation, net of income taxes |  |  |  |  |  |  |  |  | $ (2,345) | $ (857) | $ (3,142)
Diluted loss per share from discontinued operation (in US dollars per share) | $ (0.02) | $ (0.01) | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ (0.01) | $ (0.04) | $ (0.01) | $ (0.05)
United Kingdom Construction |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 0 | $ 863 | $ 345
Loss from discontinued operation, net of income taxes |  |  |  |  |  |  |  |  | $ (2,345) | $ (857) | $ (3,142)
Diluted loss per share from discontinued operation (in US dollars per share) |  |  |  |  |  |  |  |  | $ (0.04) | $ (0.01) | $ (0.05)
Assets of discontinued operation: |  |  |  |  |  |  |  |  |  |  |
Current assets | $ 0 |  |  |  | $ 242 |  |  |  | $ 0 | $ 242 |
Liabilities of discontinued operation: |  |  |  |  |  |  |  |  |  |  |
Current liabilities | $ 3,724 |  |  |  | $ 2,811 |  |  |  | $ 3,724 | $ 2,811 |

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