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Disposition of Assets (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Income Statement [Abstract] |  |  |  |  |  |
Proceeds from sale of subsidiary |  |  | $ 0 | $ 1,108 |  |
Loss on sale of subsidiary |  |  | 0 | 608 |  |
Loss from discontinued operation, net of income taxes | $ (114) | $ (1,435) | $ (469) | $ (3,476) |  |
From discontinued operation (in US dollars per share) | $ 0.00 | $ (0.02) | $ (0.01) | $ (0.05) |  |
Restructuring reserve | $ 541 | $ 155 | $ 541 | $ 155 | $ 281 | $ 194
UNITED STATES | United States Building Services [Member] | United States Building Services Subsidiary [Member] |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Proceeds from sale of subsidiary |  |  |  | 1,100 |  |
UNITED STATES | Selling, General and Administrative Expenses [Member] | United States Building Services [Member] | United States Building Services Subsidiary [Member] |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Loss on sale of subsidiary |  |  |  | 600 |  |
UNITED KINGDOM | Discontinued Operations [Member] | United Kingdom Construction [Member] |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Revenues | 84 | 5,137 | 360 | 13,983 |  |
Loss from discontinued operation, net of income taxes | $ (114) | $ (1,435) | $ (469) | $ (3,476) |  |
From discontinued operation (in US dollars per share) | $ 0.00 | $ (0.02) | $ (0.01) | $ (0.05) |  |
Assets of discontinued operation: |  |  |  |  |  |
Current assets | $ 4,318 |  | $ 4,318 |  | 6,265 |
Non-current assets | 114 |  | 114 |  | 278 |
Liabilities of discontinued operation: |  |  |  |  |  |
Current liabilities | 8,007 |  | 8,007 |  | 10,743 |
Non-current liabilities | 35 |  | 35 |  | $ 94 |
SeveranceandFacilityClosing [Member] | UNITED KINGDOM | Discontinued Operations [Member] | United Kingdom Construction [Member] |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Restructuring reserve | $ 1,100 |  | $ 1,100 |  |  |

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