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Disposition Of Assets (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of subsidiary |  |  |  |  |  |  |  |  | $ 0 | $ 1,108 | $ 0
Loss on sale of subsidiary |  |  |  |  |  |  |  |  | 0 | 608 | 0
Gain on sale of building | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 11,749 | $ 0 | $ 0 | $ 0 | 11,749 | $ 0
United States Building Services | United States Building Services Subsidiary |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of subsidiary |  |  |  |  |  |  |  |  |  | 1,100 |
Selling, General and Administrative Expenses | United States Building Services | United States Building Services Subsidiary |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on sale of subsidiary |  |  |  |  |  |  |  |  |  | $ 600 |
Gain on Sale of Building | United States Mechanical Construction And Facilities Services |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on sale of building |  |  |  |  |  | $ 11,700 |  |  |  |  |

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