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Goodwill and Related Intangible Assets (Schedule of Acquired Intangible Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Finite-lived intangible assets $ 106,806 $ 116,339
Total acquired intangible assets, Gross Carrying Amount 150,676 161,446
Accumulated Amortization, Finite-lived intangible assets 54,301 55,678
Total acquired intangible assets, Accumulated Amortization 54,301 55,678
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Finite-lived intangible assets 6,094 5,876
Accumulated Amortization, Finite-lived intangible assets 3,518 3,062
Unpatented technology and patents    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Finite-lived intangible assets 28,644 28,107
Accumulated Amortization, Finite-lived intangible assets 13,881 12,033
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Finite-lived intangible assets 70,419 80,707
Accumulated Amortization, Finite-lived intangible assets 35,678 39,652
Non-compete agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Finite-lived intangible assets 1,649 1,649
Accumulated Amortization, Finite-lived intangible assets 1,224 931
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Indefinite-lived intangible assets 43,870 45,107
Accumulated Amortization, Indefinite-lived intangible assets $ 0 $ 0
Minimum | Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life 5 years  
Minimum | Unpatented technology and patents    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life 5 years  
Minimum | Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life 5 years  
Minimum | Non-compete agreements    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life 4 years  
Maximum | Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life 15 years  
Maximum | Unpatented technology and patents    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life 20 years  
Maximum | Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life 17 years  
Maximum | Non-compete agreements    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life 10 years