Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets - Goodwill (Details)

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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]    
Beginning Balance $ 56,135 $ 57,976
Sale of assets of a business   (2,639)
Currency effects (648) 798
Goodwill acquired during the year 2,845  
Ending Balance 58,332 56,135
Goodwill impairment (1,016) (1,016)
U.S. Regions    
Goodwill [Roll Forward]    
Beginning Balance 24,759 24,759
Sale of assets of a business   0
Goodwill acquired during the year 1,611  
Ending Balance 26,370 24,759
Goodwill impairment 0 0
U.S. Federal    
Goodwill [Roll Forward]    
Beginning Balance 3,375 3,375
Sale of assets of a business   0
Goodwill acquired during the year 1,234  
Ending Balance 4,609 3,375
Goodwill impairment 0 0
Canada    
Goodwill [Roll Forward]    
Beginning Balance 3,494 3,262
Sale of assets of a business   0
Currency effects (277) 232
Goodwill acquired during the year 0  
Ending Balance 3,217 3,494
Goodwill impairment (1,016) (1,016)
Other    
Goodwill [Roll Forward]    
Beginning Balance 24,507 26,580
Sale of assets of a business   (2,639)
Currency effects (371) 566
Goodwill acquired during the year 0  
Ending Balance 24,136 24,507
Goodwill impairment $ 0 $ 0