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Schedule of Restructuring Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | $ 741 | $ 412 | $ 741 | $ 412 | $ 1,630 | $ 492
Restructuring expenses | 173 | 374 | 448 | 464 |  |
Payments for restructuring |  |  | (1,337) | (544) |  |
Employee Severance [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses | 200 | 400 | 400 | 500 |  |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | 0 | 213 | 0 | 213 | 30 | 452
Restructuring expenses |  |  | 0 | 0 |  |
Payments for restructuring |  |  | (30) | (239) |  |
UNITED STATES | Operating Segments [Member] | United States Building Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | 40 | 199 | 40 | 199 | 176 | 40
Restructuring expenses |  |  | 448 | 464 |  |
Payments for restructuring |  |  | (584) | (305) |  |
UNITED STATES | Operating Segments [Member] | Corporate, Non-Segment [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | $ 701 | $ 0 | 701 | 0 | $ 1,424 | $ 0
Restructuring expenses |  |  | 0 | 0 |  |
Payments for restructuring |  |  | $ (723) | $ 0 |  |

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