Commitments and Contingencies Commitments and Contingencies (Schedule of Rent Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Rent expense	$ 55,564	$ 53,381	$ 48,298
Selling, General and Administrative Expense [Member]
Property, Plant and Equipment [Line Items]
Rent expense	53,972	51,853	46,869
Cost of Sales [Member]
Property, Plant and Equipment [Line Items]
Rent expense	$ 1,592	$ 1,528	$ 1,429