Leases (Components Of Lease Expense) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Lease Expense
Operating lease expense	[1]	$ 14,610	$ 11,537
Sublease income	[1]		(6)
Net lease expense	[1]	$ 14,610	$ 11,531

[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.