Leasing (Net Rent Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Leases, Rent Expense, Net [Abstract]
Minimum operating lease expense	$ 247,039	$ 234,113	$ 226,158
Contingent rents	701	744	534
Other lease related occupancy costs	11,257	10,043	8,821
Total rent expense	258,997	244,900	235,513
Less: sublease income	4,105	4,031	4,616
Net rent expense	$ 254,892	$ 240,869	$ 230,897