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