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
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Goodwill [Roll Forward]      
Balance, December 31, 2017   $ 56,135  
Goodwill acquired during the year $ 1,431 1,431  
Currency effects   (298)  
Balance, June 30, 2018 57,268 57,268  
Accumulated goodwill impairment (1,016) (1,016) $ (1,016)
Operating Segments | U.S. Regions      
Goodwill [Roll Forward]      
Balance, December 31, 2017   24,759  
Goodwill acquired during the year   0  
Currency effects   0  
Balance, June 30, 2018 24,759 24,759  
Accumulated goodwill impairment 0 0 0
Operating Segments | U.S. Federal      
Goodwill [Roll Forward]      
Balance, December 31, 2017   3,375  
Goodwill acquired during the year   1,431  
Currency effects   0  
Balance, June 30, 2018 4,806 4,806  
Accumulated goodwill impairment 0 0 0
Operating Segments | Canada      
Goodwill [Roll Forward]      
Balance, December 31, 2017   3,494  
Goodwill acquired during the year   0  
Currency effects   (157)  
Balance, June 30, 2018 3,337 3,337  
Accumulated goodwill impairment (1,016) (1,016) (1,016)
Operating Segments | Non-solar DG      
Goodwill [Roll Forward]      
Balance, December 31, 2017   0  
Goodwill acquired during the year   0  
Currency effects   0  
Balance, June 30, 2018 0 0  
Accumulated goodwill impairment 0 0 0
Operating Segments | Other      
Goodwill [Roll Forward]      
Balance, December 31, 2017   24,507  
Goodwill acquired during the year   0  
Currency effects   (141)  
Balance, June 30, 2018 24,366 24,366  
Accumulated goodwill impairment $ 0 $ 0 $ 0