Commitments And Contingencies (Operating Lease Rental Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 31, 2019
Operating Leased Assets [Line Items]
Operating lease liability	$ 198,672
Operating Leases, Rent Expense, Net [Abstract]
Minimum rentals	66,049	$ 78,779	$ 87,995
Contingent rentals	14,297	14,294	14,596
Total rent expense	80,346	93,073	102,591
Common area maintenance, parking and storage.	$ 9,300	$ 10,000	$ 10,200
Subsequent event
Operating Leased Assets [Line Items]
Operating lease liability				$ 20,400