Finance Receivables Finance Receivables, net (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010
Finance Receivables, net [Line Items]
Notes, Loans and Financing Receivable, Net	$ 10,030,657		$ 9,162,492
Consumer Loan [Member]
Finance Receivables, net [Line Items]
Pre-Acquisition Finance Receivables Outstanding Balance	3,100,850		4,366,075
Pre-Acquisition Finance Receivables, Carrying Value	2,812,205		4,027,361
Post-Acquisition Finance Receivables, Carrying Value	7,340,242		5,313,899
Finance Receivables, Carrying Value	10,152,447		9,341,260
Allowance for Notes, Loans and Financing Receivable	249,350		178,768
Notes, Loans and Financing Receivable, Net	9,903,097		9,162,492
Consumer Loans Auto Financing Receivable [Member]
Finance Receivables, net [Line Items]
Pre-Acquisition Finance Receivables, Carrying Value		3,357,341	4,027,361		6,337,075	7,299,963
Post-Acquisition Finance Receivables, Carrying Value		6,326,427	5,313,899		2,004,813	923,713
Finance Receivables, Carrying Value	10,152,447			8,694,541
Consumer Loans Auto Financing Receivable [Member]
Finance Receivables, net [Line Items]
Finance Receivables, Carrying Value	127,560
Notes, Loans and Financing Receivable, Net	$ 127,560