Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Balance Sheet information regarding entities accounted for as discontinued operations
Total liabilities	$ 62,156	$ 103,001
Retail
Combined financial information regarding entities accounted for as discontinued operations
Revenues	429,635	742,048	791,063
Pre-tax (loss) income	(16,389)	421	(16,322)
Gain (loss) on disposal	8,059	3,313	(3,955)
Balance Sheet information regarding entities accounted for as discontinued operations
Inventory	53,688	85,385
Other assets	40,753	73,858
Total assets	94,441	159,243
Floor plan notes payable (including non-trade)	45,593	79,145
Other liabilities	16,563	23,856
Total liabilities	$ 62,156	$ 103,001