Goodwill And Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 38,800	$ 37,300
Estimated future amortization expense in year 2020	120,200
Estimated future amortization expense in year 2021	119,100
Estimated future amortization expense in year 2022	73,500
Estimated future amortization expense in year 2023	58,400
Estimated future amortization expense in year 2024	32,000
Estimated future amortization expense thereafter	$ 91,700
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years