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Goodwill and Intangible Assets (Intangible Assets Subject to Amortization) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2021
Jun. 30, 2020
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]      
Historical Cost $ 1,597,836   $ 1,613,922
Accumulated Amortization 940,009   904,142
Net $ 657,827   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 9 months 18 days 10 years  
Historical Cost $ 258,338   260,715
Accumulated Amortization 104,344   100,273
Net $ 153,994   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 $ 67,951   67,980
Accumulated Amortization 67,070   66,964
Net $ 881   1,016
Customer relationships, net      
Finite-Lived Intangible Assets [Line Items]      
Weighted-Average   Amortization Period 8 years 8 years  
Historical Cost $ 837,933   848,875
Accumulated Amortization 488,132   471,681
Net $ 349,801   $ 377,194
Customer relationships, net | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Weighted-Average   Amortization Period 4 years   4 years
Customer relationships, net | 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 $ 433,614   $ 436,352
Accumulated Amortization 280,463   265,224
Net $ 153,151   $ 171,128