Commitments And Contingencies (Operating Lease Rental Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating Leases, Rent Expense, Net [Abstract]
Minimum rentals	$ 19,505	$ 21,983	$ 60,693	$ 66,967
Contingent rentals	4,264	4,789	12,086	12,467
Less: Sublease rentals	(55)	(21)	(144)	(139)
Total rent expense	23,714	26,751	72,635	79,295
Common area maintenance, parking and storage.	$ 2,500	$ 2,500	$ 7,700	$ 7,700