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Commitments and Contingencies Restructuring and Related Activities (Tables) | 9 Months Ended
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Sep. 30, 2017
Restructuring and Related Activities [Abstract] |
Schedule of Restructuring Reserve by Type of Cost [Table Text Block] | The changes in restructuring activity by reportable segments during the nine months ended September 30, 2017 and 2016 were as follows (in thousands):
|  | United States mechanical construction and facilities services segment |  | United States building services segment |  | Total
Balance at December 31, 2015 |  | $ | — |  |  | $ | 81 |  |  | $ | 81 |
Charges |  | 401 |  |  | 870 |  |  | 1,271 |
Payments |  | (108 | ) |  | (770 | ) |  | (878 | )
Balance at September 30, 2016 |  | $ | 293 |  |  | $ | 181 |  |  | $ | 474 |
Balance at December 31, 2016 |  | $ | 188 |  |  | $ | 13 |  |  | $ | 201 |
Charges |  | 181 |  |  | 773 |  |  | 954 |
Payments |  | (369 | ) |  | (737 | ) |  | (1,106 | )
Balance at September 30, 2017 |  | $ | — |  |  | $ | 49 |  |  | $ | 49 |

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- Definition Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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