Leases (Components Of Lease Expense) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lease Expense
Operating lease expense	[1]	$ 15,103	$ 11,573	$ 29,731	$ 23,098
Sublease income	[1]	(7)		(7)	(6)
Net lease expense	[1]	$ 15,096	$ 11,573	$ 29,724	$ 23,092

[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.