Leases Operating Leases (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	$ 118,964	$ 111,861	$ 94,137
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Leases, Future Minimum Payments Due, Current	88,997
Operating Leases, Future Minimum Payments, Due in Two Years	74,485
Operating Leases, Future Minimum Payments, Due in Three Years	65,072
Operating Leases, Future Minimum Payments, Due in Four Years	44,453
Operating Leases, Future Minimum Payments, Due in Five Years	34,025
Operating Leases, Future Minimum Payments, Due Thereafter	132,637
Operating Leases, Future Minimum Payments Due	$ 439,669