Segment Reporting (Reconciliation Of Segment Assets To Consolidated Assets) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Total segment assets	$ 2,611,931	$ 2,118,760	$ 1,938,214
Deferred tax assets and income tax receivable	57,521	59,868	64,238
Consolidated assets	2,669,452	2,178,628	2,002,452
Auction [Member]
Total segment assets	2,306,823	1,784,045	1,682,993
Finance [Member]
Total segment assets	197,933	244,463	153,010
Dealer [Member]
Total segment assets	105,595	88,845	100,516
All Other [Member]
Total segment assets	$ 1,580	$ 1,407	$ 1,695