Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets- Goodwill (Details)

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Goodwill and Intangible Assets- Goodwill (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Goodwill [Roll Forward]    
Beginning balance $ 57,976  
Sale of assets of a business (2,639)  
Currency effects 770  
Ending balance 56,107  
Accumulated Goodwill Impairment (1,016) $ (1,016)
Operating Segments | U.S. Regions    
Goodwill [Roll Forward]    
Beginning balance 24,759  
Sale of assets of a business 0  
Currency effects 0  
Ending balance 24,759  
Accumulated Goodwill Impairment 0 0
Operating Segments | U.S. Federal    
Goodwill [Roll Forward]    
Beginning balance 3,375  
Sale of assets of a business 0  
Currency effects 0  
Ending balance 3,375  
Accumulated Goodwill Impairment 0 0
Operating Segments | Canada    
Goodwill [Roll Forward]    
Beginning balance 3,262  
Sale of assets of a business 0  
Currency effects 253  
Ending balance 3,515  
Accumulated Goodwill Impairment (1,016) (1,016)
Operating Segments | Small-Scale Infrastructure    
Goodwill [Roll Forward]    
Beginning balance 0  
Sale of assets of a business 0  
Currency effects 0  
Ending balance 0  
Accumulated Goodwill Impairment 0 0
Operating Segments | Other    
Goodwill [Roll Forward]    
Beginning balance 26,580  
Sale of assets of a business (2,639)  
Currency effects 517  
Ending balance 24,458  
Accumulated Goodwill Impairment $ 0 $ 0