Commitments And Contingencies (Operating Lease Rental Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leases, Rent Expense, Net [Abstract]
Minimum rentals	$ 78,961	$ 88,182	$ 96,579
Contingent rentals	14,294	14,596	14,929
Less: Sublease rentals	(182)	(187)	(322)
Total rent expense	93,073	102,591	111,186
Common area maintenance, parking and storage.	$ 10,000	$ 10,200	$ 9,100