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Goodwill and Intangible Assets (Intangible Assets Subject to Amortization) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Historical Cost $ 1,560,130 $ 1,613,922
Accumulated Amortization 950,697 904,142
Net $ 609,433 $ 709,780
Minimum    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average   Amortization Period 1 year  
Maximum    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average   Amortization Period 20 years  
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average   Amortization Period 9 years 8 months 12 days 10 years
Historical Cost $ 258,382 $ 260,715
Accumulated Amortization 107,472 100,273
Net $ 150,910 $ 160,442
Patent and patent licenses    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average   Amortization Period 5 years 4 months 24 days 5 years 6 months
Historical Cost $ 67,962 $ 67,980
Accumulated Amortization 67,250 66,964
Net $ 712 $ 1,016
Customer relationship    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average   Amortization Period 8 years 7 months 6 days 8 years
Historical Cost $ 764,852 $ 848,875
Accumulated Amortization 462,955 471,681
Net $ 301,897 $ 377,194
Customer relationship | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average   Amortization Period 4 years 4 years
Customer relationship | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average   Amortization Period 5 years 5 years
Other purchased intangibles    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average   Amortization Period 4 years 2 months 12 days 4 years 3 months 18 days
Historical Cost $ 468,934 $ 436,352
Accumulated Amortization 313,020 265,224
Net $ 155,914 $ 171,128