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Operations and Summary of Significant Accounting Policies - Goodwill (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2016
USD ($)
location
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Goodwill Impairment Testing                        
Impairment of goodwill $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0   $ 0 $ 0 $ 530
Goodwill [Roll Forward]                        
Goodwill at beginning of period, gross       148,031       147,961   148,031 147,961  
Accumulated impairment losses, beginning of period       (24,081)       (24,080)   (24,081) (24,080)  
Goodwill at the beginning of the period, net       123,950       123,881   123,950 123,881  
Goodwill acquired                   1,848 2,070  
Foreign exchange                   (880) (2,001)  
Reclassifications of goodwill                   439    
Goodwill at end of period, gross 148,560       148,031         148,560 148,031 147,961
Accumulated impairment losses, end of period (24,081)       (24,081)         (24,081) (24,081) (24,080)
Goodwill at the end of the period, net 124,479       123,950         $ 124,479 123,950 123,881
Bierbach GmbH and Co KG                        
Goodwill Impairment Testing                        
Impairment of goodwill                 $ 500      
United States                        
Goodwill Impairment Testing                        
Number of locations into which the activities will be consolidated | location                   4    
Australia                        
Goodwill Impairment Testing                        
Number of locations into which the activities will be consolidated | location                   4    
S&P Clever                        
Goodwill Impairment Testing                        
Number of locations into which the activities will be consolidated | location                   8    
North America                        
Goodwill [Roll Forward]                        
Goodwill at beginning of period, gross       96,500       95,192   $ 96,500 95,192  
Accumulated impairment losses, beginning of period       (10,666)       (10,666)   (10,666) (10,666)  
Goodwill at the beginning of the period, net       85,834       84,526   85,834 84,526  
Goodwill acquired                   0 1,860  
Foreign exchange                   93 (552)  
Reclassifications of goodwill                   439    
Goodwill at end of period, gross 96,154       96,500         96,154 96,500 95,192
Accumulated impairment losses, end of period (10,666)       (10,666)         (10,666) (10,666) (10,666)
Goodwill at the end of the period, net 85,488       85,834         85,488 85,834 84,526
Europe                        
Goodwill [Roll Forward]                        
Goodwill at beginning of period, gross       50,135       51,202   50,135 51,202  
Accumulated impairment losses, beginning of period       (13,415)       (13,414)   (13,415) (13,414)  
Goodwill at the beginning of the period, net       36,720       37,788   36,720 37,788  
Goodwill acquired                   1,848 210  
Foreign exchange                   (952) (1,278)  
Goodwill at end of period, gross 51,031       50,135         51,031 50,135 51,202
Accumulated impairment losses, end of period (13,415)       (13,415)         (13,415) (13,415) (13,414)
Goodwill at the end of the period, net 37,616       36,720         37,616 36,720 37,788
Asia/Pacific                        
Goodwill [Roll Forward]                        
Goodwill at beginning of period, gross       1,396       1,567   1,396 1,567  
Accumulated impairment losses, beginning of period       0       0   0 0  
Goodwill at the beginning of the period, net       $ 1,396       $ 1,567   1,396 1,567  
Goodwill acquired                   0 0  
Foreign exchange                   (21) (171)  
Goodwill at end of period, gross 1,375       1,396         1,375 1,396 1,567
Accumulated impairment losses, end of period 0       0         0 0 0
Goodwill at the end of the period, net $ 1,375       $ 1,396         1,375 $ 1,396 $ 1,567
Patents                        
Goodwill [Roll Forward]                        
Reclassifications                   (212)    
Noncompete Agreements Trademarks and Other                        
Goodwill [Roll Forward]                        
Reclassifications                   (119)    
Customer Relationships                        
Goodwill [Roll Forward]                        
Reclassifications                   $ (46)