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, 2015
Dec. 31, 2014
Goodwill [Roll Forward]    
Balance, December 31, 2014 $ 60,479  
Goodwill acquired during the year 0  
Fair value adjustment (403)  
Currency effects (705)  
Balance, September 30, 2015 59,371  
Accumulated Goodwill Impairment (1,016) $ (1,016)
Operating Segments | U.S. Regions    
Goodwill [Roll Forward]    
Balance, December 31, 2014 24,759  
Goodwill acquired during the year 0  
Fair value adjustment 0  
Currency effects 0  
Balance, September 30, 2015 24,759  
Accumulated Goodwill Impairment 0 0
Operating Segments | U.S. Federal    
Goodwill [Roll Forward]    
Balance, December 31, 2014 3,375  
Goodwill acquired during the year 0  
Fair value adjustment 0  
Currency effects 0  
Balance, September 30, 2015 3,375  
Accumulated Goodwill Impairment 0 0
Operating Segments | Canada    
Goodwill [Roll Forward]    
Balance, December 31, 2014 3,781  
Goodwill acquired during the year 0  
Fair value adjustment 0  
Currency effects (511)  
Balance, September 30, 2015 3,270  
Accumulated Goodwill Impairment (1,016) (1,016)
Operating Segments | Small-Scale Infrastructure    
Goodwill [Roll Forward]    
Balance, December 31, 2014 0  
Goodwill acquired during the year 0  
Fair value adjustment 0  
Currency effects 0  
Balance, September 30, 2015 0  
Accumulated Goodwill Impairment 0 0
Operating Segments | Other    
Goodwill [Roll Forward]    
Balance, December 31, 2014 28,564  
Goodwill acquired during the year 0  
Fair value adjustment (403)  
Currency effects (194)  
Balance, September 30, 2015 27,967  
Accumulated Goodwill Impairment $ 0 $ 0