Commitments and Contingencies (Operating Lease Rental Expense) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Operating Leases Rent Expense [Abstract]
Minimum rentals	[1]	$ 25,106	$ 28,110	$ 49,858	$ 55,649
Contingent rentals		5,927	7,261	8,005	9,684
Less: Sublease rentals		(59)	(243)	(118)	(447)
Total rent expense		30,974	35,128	57,745	64,886
Common area maintenance, parking and storage.		$ 2,400	$ 2,500	$ 4,700	$ 4,900

[1] Minimum rentals include all lease payments as well as fixed and variable common area maintenance, parking and storage fees, which were approximately $2.4 million and $2.5 million during the three months ended June 30, 2015 and 2014, respectively, and $4.7 million and $4.9 million during the six months ended June 30, 2015 and 2014, respectively