Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets- Goodwill (Details)

v3.8.0.1
Goodwill and Intangible Assets- Goodwill (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]    
Beginning balance $ 56,135  
Currency effects 159  
Ending balance 56,294  
Accumulated Goodwill Impairment (1,016) $ (1,016)
Operating Segments | U.S. Regions    
Goodwill [Roll Forward]    
Beginning balance 24,759  
Currency effects 0  
Ending balance 24,759  
Accumulated Goodwill Impairment 0 0
Operating Segments | U.S. Federal    
Goodwill [Roll Forward]    
Beginning balance 3,375  
Currency effects 0  
Ending balance 3,375  
Accumulated Goodwill Impairment 0 0
Operating Segments | Canada    
Goodwill [Roll Forward]    
Beginning balance 3,494  
Currency effects (95)  
Ending balance 3,399  
Accumulated Goodwill Impairment (1,016) (1,016)
Operating Segments | Non-solar DG    
Goodwill [Roll Forward]    
Beginning balance 0  
Currency effects 0  
Ending balance 0  
Accumulated Goodwill Impairment 0 0
Operating Segments | Other    
Goodwill [Roll Forward]    
Beginning balance 24,507  
Currency effects 254  
Ending balance 24,761  
Accumulated Goodwill Impairment $ 0 $ 0