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Operations and Summary of Significant Accounting Policies - Goodwill (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
location
Dec. 31, 2016
USD ($)
Goodwill [Roll Forward]    
Goodwill at beginning of period, gross $ 148,560 $ 148,031
Accumulated impairment losses, beginning of period (24,081) (24,081)
Goodwill at the beginning of the period, net 124,479 123,950
Goodwill acquired 10,066 1,848
Foreign exchange 2,784 (880)
Reclassifications of goodwill 189 439
Goodwill at end of period, gross 161,221 148,560
Accumulated impairment losses, end of period (24,081) (24,081)
Goodwill at the end of the period, net $ 137,140 124,479
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 9  
Denmark Reporting Unit    
Goodwill Impairment Testing    
Percentage of fair value in excess of carrying amount 8.30%  
Goodwill, impairment loss $ 7,100  
Increase in Discount Rate 5.00%  
Decrease in Multiple Rate 2.10%  
Decrease in CAGR 1.39%  
Decrease in Average Annual Pre-Tax Operating Profit 37.00%  
North America    
Goodwill [Roll Forward]    
Goodwill at beginning of period, gross $ 96,154 96,500
Accumulated impairment losses, beginning of period (10,666) (10,666)
Goodwill at the beginning of the period, net 85,488 85,834
Goodwill acquired 10,066 0
Foreign exchange 198 93
Reclassifications of goodwill (3) 439
Goodwill at end of period, gross 106,421 96,154
Accumulated impairment losses, end of period (10,666) (10,666)
Goodwill at the end of the period, net 95,755 85,488
Europe    
Goodwill [Roll Forward]    
Goodwill at beginning of period, gross 51,031 50,135
Accumulated impairment losses, beginning of period (13,415) (13,415)
Goodwill at the beginning of the period, net 37,616 36,720
Goodwill acquired 0 1,848
Foreign exchange 2,472 (952)
Reclassifications of goodwill 192 0
Goodwill at end of period, gross 53,311 51,031
Accumulated impairment losses, end of period (13,415) (13,415)
Goodwill at the end of the period, net 39,896 37,616
Asia/Pacific    
Goodwill [Roll Forward]    
Goodwill at beginning of period, gross 1,375 1,396
Accumulated impairment losses, beginning of period 0 0
Goodwill at the beginning of the period, net 1,375 1,396
Goodwill acquired 0 0
Foreign exchange 114 (21)
Reclassifications of goodwill   0
Goodwill at end of period, gross 1,489 1,375
Accumulated impairment losses, end of period 0 0
Goodwill at the end of the period, net 1,489 1,375
Patents    
Goodwill [Roll Forward]    
Reclassifications   212
Noncompete Agreements Trademarks and Other    
Goodwill [Roll Forward]    
Reclassifications   119
Customer Relationships    
Goodwill [Roll Forward]    
Reclassifications $ (626) $ 46