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Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Indefinite Life Intangible Assets [Abstract]      
Goodwill $ 114,954 $ 112,446  
Trademarks and trade names 24,599 24,599  
Other indefinite lived intangibles 3,763 0  
Total goodwill and indefinite lived intangibles 143,316 137,045  
Finite Life Intangible Assets [Abstract]      
Gross carrying amount 129,391 128,304  
Accumulated amortization $ 94,200 85,894  
Weighted average amortization period 15 years    
Amortization expense $ 8,400 8,600 $ 8,400
Writeoff of fully amortized intangible assets   12,000  
Annual Estimated Future Amortization Expense [Abstract]      
2017 8,460    
2018 7,650    
2019 7,480    
2020 4,160    
2021 2,730    
Impairment Charges [Abstract]      
Goodwill impairment charge 0 0 0
Indefinite life intangible assets impairment charge 0 0 $ 0
Scanner Technology [Member]      
Finite Life Intangible Assets [Abstract]      
Gross carrying amount 46,482 46,482  
Accumulated amortization $ 36,624 33,590  
Weighted average amortization period 18 years    
Developed Technology [Member]      
Finite Life Intangible Assets [Abstract]      
Gross carrying amount $ 22,500 22,500  
Accumulated amortization $ 18,383 17,558  
Weighted average amortization period 20 years    
Distribution Network [Member]      
Finite Life Intangible Assets [Abstract]      
Gross carrying amount $ 11,598 11,598  
Accumulated amortization $ 11,598 11,096  
Weighted average amortization period 15 years    
Trademarks [Member]      
Finite Life Intangible Assets [Abstract]      
Gross carrying amount $ 2,592 2,409  
Accumulated amortization $ 1,011 879  
Weighted average amortization period 15 years    
Other [Member]      
Finite Life Intangible Assets [Abstract]      
Gross carrying amount $ 46,219 45,315  
Accumulated amortization $ 26,584 $ 22,771  
Weighted average amortization period 8 years