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Commitments and Contingencies
 9 Months Ended
Sep. 30, 2019
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.
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. Other potential claims may exist that have not yet been asserted against us. We do not believe that any such matters will have a material adverse effect on our financial position, results of operations or liquidity. Litigation is subject to many uncertainties and the outcome of litigation is not predictable with assurance. It is possible that some litigation matters for which liabilities have not been recorded could be decided unfavorably to us, and that any such unfavorable decisions could have a material adverse effect on our financial position, results of operations or liquidity.
Restructuring expenses        
Restructuring expenses, relating to employee severance obligations, were $0.1 million and $0.6 million for the three and nine months ended September 30, 2019, respectively, and $0.2 million and $0.7 million for the three and nine months ended September 30, 2018, respectively. As of September 30, 2019, the balance of restructuring obligations yet to be paid was $0.7 million. Such remaining amounts will be paid pursuant to our contractual obligations throughout 2020 and 2021. No material expenses in connection with restructuring from continuing operations are expected to be incurred during the remainder of 2019.
The changes in restructuring activity by reportable segment during the nine months ended September 30, 2019 and 2018 were as follows (in thousands):    
 
 
United States
electrical
construction
and facilities
services segment
 
United States building services segment
 
Corporate administration
 
Total
Balance at December 31, 2017
 
$
452

 
$
40

 
$
—

 
$
492

Charges
 
—

 
693

 
—

 
693

Payments
 
(330
)
 
(646
)
 
—

 
(976
)
Balance at September 30, 2018
 
$
122

 
$
87

 
$
—

 
$
209

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