Leases (Components Of Lease Expense) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Lease Expense
Operating lease expense	[1]	$ 60,195	$ 49,112
Sublease income	[1]	(83)	(6)
Net lease expense	[1]	$ 60,112	$ 49,106

[1] Includes short-term leases and variable lease costs, which are immaterial. Included in both cost of services provided and goods sold and selling, general and administrative expenses.