Inventory Financing Agreements (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Inventory Financing Agreements [Line Items]
Accounts Payable Inventory Financing	$ 256,600,000	$ 249,200,000
Accounts Payable, Inventory Financing [Member]
Inventory Financing Agreements [Line Items]
Revolving Loan financing agreement	256,100,000	248,300,000
Other inventory financing agreements	500,000	900,000
Accounts Payable Inventory Financing	256,600,000	249,200,000
Floorplan sub-facility	400,000,000
Other Collateralized Inventory Financing Agreements, Current	$ 500,000	$ 900,000