Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies( Details) [Abstract]
Rental expense	$ 240,900,000	$ 235,600,000	$ 230,300,000
Future Minimum Rental Payment under Operating Leases (Table Details) [Abstract]
2014	189,353,000
2015	156,673,000
2016	115,214,000
2017	71,244,000
2018	30,683,000
Thereafter	3,868,000
Operating lease payments, total	567,035,000
Guarantor Obligations [Line Items]
Maximum financing amount	60,000,000
Amount outstanding	17,200,000
Citibank [Member]
Guarantor Obligations [Line Items]
Maximum financing amount	40,000,000
Texas Capital Bank [Member]
Guarantor Obligations [Line Items]
Maximum financing amount	$ 20,000,000