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Goodwill and Intangible Assets (Intangible Assets Subject to Amortization) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Historical Cost $ 1,646,323 $ 1,613,922
Accumulated Amortization 989,139 904,142
Net $ 657,184 $ 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 7 months 6 days 10 years
Historical Cost $ 269,782 $ 260,715
Accumulated Amortization 109,994 100,273
Net $ 159,788 $ 160,442
Patent and patent licenses    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average   Amortization Period 5 years 6 months 5 years 6 months
Historical Cost $ 67,973 $ 67,980
Accumulated Amortization 67,151 66,964
Net $ 822 $ 1,016
Customer relationship    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average   Amortization Period 8 years 8 years
Historical Cost $ 844,952 $ 848,875
Accumulated Amortization 514,540 471,681
Net $ 330,412 $ 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 3 months 18 days 4 years 3 months 18 days
Historical Cost $ 463,616 $ 436,352
Accumulated Amortization 297,454 265,224
Net $ 166,162 $ 171,128