Segment Reporting (Schedule Of Revenue And (Loss) Income Before Taxes by Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting [Line Items]
Revenues	$ 104,959	$ 119,582
Investment Income, Interest	609	2,590
Interest Expense	10,108	10,388
Segment (loss) income before taxes	(16,463)	3,551
Short-term interest-free advance maturity term	6
Auction [Member]
Segment Reporting [Line Items]
Revenues	97,410	110,361
Segment (loss) income before taxes	(19,479)	1,135
Finance [Member]
Segment Reporting [Line Items]
Revenues	4,986	4,285
Segment (loss) income before taxes	3,631	3,438
Dealer [Member]
Segment Reporting [Line Items]
Revenues	2,678	4,615
Segment (loss) income before taxes	(957)	(2,481)
All Other [Member]
Segment Reporting [Line Items]
Revenues	1,296	1,691
Segment (loss) income before taxes	743	1,280
Reconciling Items [Member]
Segment Reporting [Line Items]
Revenues	(1,411)	(1,370)
Segment (loss) income before taxes	$ (401)	$ 179
Short-term interest-free advance maturity term	3