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Schedule of Restructuring Activities (Details) - USD ($) $ 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
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | $ 541 | $ 155 | $ 541 | $ 155 | $ 281 | $ 194
Restructuring expenses | 433 | 176 | 441 | 401 |  |
Payments for restructuring |  |  | (181) | (440) |  |
Employee Severance [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses | 500 | 200 | 547 | 200 |  |
Facility Closing [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  |  |  | 200 |  |
Reversal of restructuring expenses | (100) |  | (106) |  |  |
Corporate, Non-Segment [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | 0 | 0 | 0 | 0 | 0 | 0
Restructuring expenses |  |  | 0 | 300 |  |
Payments for restructuring |  |  | 0 | (300) |  |
Corporate, Non-Segment [Member] | Employee Severance [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  |  | 0 |  |  |
Corporate, Non-Segment [Member] | Facility Closing [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  |  | 0 |  |  |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | 0 | 155 | 0 | 155 | 255 | 30
Restructuring expenses |  |  |  | 182 |  |
Reversal of restructuring expenses |  |  | (106) |  |  |
Payments for restructuring |  |  | (149) | (57) |  |
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | 0 | 0 | 0 | 0 | 26 | 164
Restructuring expenses |  |  | 6 |  |  |
Reversal of restructuring expenses |  |  |  | (81) |  |
Payments for restructuring |  |  | (32) | (83) |  |
UNITED STATES | Operating Segments [Member] | United States Building Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | $ 541 | $ 0 | 541 | 0 | $ 0 | $ 0
Restructuring expenses |  |  | 541 | 0 |  |
Payments for restructuring |  |  | 0 | $ 0 |  |
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  |  | 0 |  |  |
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  |  | 6 |  |  |
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Building Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  |  | 541 |  |  |
UNITED STATES | Operating Segments [Member] | Facility Closing [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Reversal of restructuring expenses |  |  | (106) |  |  |
UNITED STATES | Operating Segments [Member] | Facility Closing [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  |  | 0 |  |  |
UNITED STATES | Operating Segments [Member] | Facility Closing [Member] | United States Building Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  |  | $ 0 |  |  |

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