Goodwill and Intangible Assets (Intangible Assets Subject to Amortization) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Historical Cost	$ 1,275,973	$ 1,275,048
Accumulated Amortization	848,141	750,180
Net	$ 427,832	$ 524,868
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	10 years 1 month 6 days	10 years 2 months 12 days
Historical Cost	$ 193,701	$ 193,202
Accumulated Amortization	94,259	82,552
Net	$ 99,442	$ 110,650
Patent and patent licenses
Finite-Lived Intangible Assets [Line Items]
Weighted-Average   Amortization Period	5 years 6 months	6 years 6 months
Historical Cost	$ 67,949	$ 67,921
Accumulated Amortization	66,805	63,143
Net	$ 1,144	$ 4,778
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-Average   Amortization Period	8 years 6 months	8 years 6 months
Historical Cost	$ 630,768	$ 630,730
Accumulated Amortization	440,079	392,228
Net	$ 190,689	$ 238,502
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Weighted-Average   Amortization Period	4 years	4 years
Customer relationships | 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 4 months 24 days	4 years 3 months 18 days
Historical Cost	$ 383,555	$ 383,195
Accumulated Amortization	246,998	212,257
Net	$ 136,557	$ 170,938