Goodwill And Intangible Assets (Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets [Abstract]
Amortization of Intangible Assets	$ 129,000	$ 95,300	$ 74,000
Estimated future amortization expense in year 2018	122,294
Estimated future amortization expense in year 2019	103,172
Estimated future amortization expense in year 2020	54,315
Estimated future amortization expense in year 2021	35,280
Estimated future amortization expense in year 2022	30,231
Estimated future amortization expense thereafter	107,648
Finite-Lived Intangible Assets, Net	$ 452,940	$ 478,880