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Commitments and Contingencies
 9 Months Ended
Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]  
Commitments and Contingencies Commitments and Contingencies
Government Contracts
As a government contractor, we are subject to U.S. government audits and investigations relating to our operations, fines, penalties and compensatory and treble damages, and possible suspension or debarment from doing business with the government. Based on currently available information, we believe the outcome of ongoing government disputes and investigations will not have a material impact on our financial position, results of operations or liquidity.
Computer System Attack
On February 15, 2020, we became aware on an infiltration and encryption of portions of our information technology network. This attack temporarily disrupted our use of the impacted systems. As part of our investigation into this incident, we engaged outside security experts, who did not identify any exfiltration of customer or employee data or any inappropriate access to our accounting or finance systems. The Company maintains insurance coverage for these types of incidents; such policies, however, may not completely provide coverage for, or completely offset the costs of, this infiltration.
Legal Proceedings     
We are involved in several legal proceedings in which damages and claims have been asserted against us. We believe that we have a number of valid defenses to such proceedings and claims and intend to vigorously defend ourselves. We do not believe that any such matters will have a material adverse effect on our financial position, results of operations, or liquidity. We record a loss contingency if the potential loss from a proceeding or claim is considered probable and the amount can be reasonably estimated or a range of loss can be determined. We provide disclosure when it is reasonably possible that a loss will be incurred in excess of any recorded provision. Significant judgment is required in these determinations. As additional information becomes available, we reassess prior determinations and may change our estimates. Additional claims may be asserted against us in the future. Litigation is subject to many uncertainties, and the outcome of litigation is not predictable with assurance. It is possible that a litigation matter for which liabilities have not been recorded could be decided unfavorably to us, and that any such unfavorable decision could have a material adverse effect on our financial position, results of operations or liquidity.
NOTE 13 Commitments and Contingencies - (Continued)
Restructuring expenses        
The table below summarizes restructuring activity by reportable segment during the nine months ended September 30, 2020 and 2019 (in thousands):    
United States
electrical
construction
and facilities
services segment		United States
mechanical
construction
and facilities
services segment		United States building services segmentCorporate administrationTotal
Balance at December 31, 2018$30 $— $176 $1,424 $1,630 
Charges— — 567 — 567 
Payments(30)— (708)(723)(1,461)
Balance at September 30, 2019$— $— $35 $701 $736 
Balance at December 31, 2019$445 $— $412 $701 $1,558 
Charges268 268 69 — 605 
Payments(189)— (481)(355)(1,025)
Balance at September 30, 2020$524 $268 $— $346 $1,138 
As of September 30, 2020, the balance of restructuring obligations yet to be paid was approximately $1.1 million. Such remaining amounts will be paid pursuant to our contractual obligations through 2022.