Goodwill And Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 35,600	$ 44,500	$ 74,400	$ 81,800
Estimated future amortization expense in year 2020	82,300		82,300
Estimated future amortization expense in year 2021	119,900		119,900
Estimated future amortization expense in year 2022	69,100		69,100
Estimated future amortization expense in year 2023	64,700		64,700
Estimated future amortization expense in year 2024	35,400		35,400
Estimated future amortization expense thereafter	$ 89,400		$ 89,400
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