Finance Receivables Credit Quality Indicators (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 loan		Dec. 31, 2011 loan
Financing Receivable, Recorded Investment [Line Items]
Average original term of loan	57 months
Average life of loan	31 months
Concentration of Credit Risk [Abstract]
Percentage of Portfolio Contracts	100.00%		100.00%
Total Contracts	140,748		137,293
Percentage of Portfolio Principal	100.00%		100.00%
Loan Principal	$ 1,601,710		$ 1,466,680
A Plus [Member]
Concentration of Credit Risk [Abstract]
Average FICO Score	556	[1]	557	[1]
Percentage of Portfolio Contracts	10.40%		10.40%
Total Contracts	14,660		14,270
Percentage of Portfolio Principal	10.60%		10.70%
Loan Principal	169,023		156,935
A [Member]
Concentration of Credit Risk [Abstract]
Average FICO Score	539	[1]	538	[1]
Percentage of Portfolio Contracts	18.50%		18.20%
Total Contracts	25,998		24,954
Percentage of Portfolio Principal	18.80%		18.70%
Loan Principal	301,173		274,269
B [Member]
Concentration of Credit Risk [Abstract]
Average FICO Score	517	[1]	516	[1]
Percentage of Portfolio Contracts	37.30%		36.80%
Total Contracts	52,476		50,582
Percentage of Portfolio Principal	38.20%		38.30%
Loan Principal	612,084		561,738
C [Member]
Concentration of Credit Risk [Abstract]
Average FICO Score	503	[1]	500	[1]
Percentage of Portfolio Contracts	28.40%		28.20%
Total Contracts	40,066		38,756
Percentage of Portfolio Principal	27.80%		27.10%
Loan Principal	445,497		397,470
C Minus [Member]
Concentration of Credit Risk [Abstract]
Average FICO Score	488	[1]	486	[1]
Percentage of Portfolio Contracts	3.90%		4.70%
Total Contracts	5,447		6,400
Percentage of Portfolio Principal	3.30%		3.80%
Loan Principal	53,512		55,734
Internally Assigned Credit Grade D And Below [Member]
Concentration of Credit Risk [Abstract]
Average FICO Score	478	[1]	475	[1]
Percentage of Portfolio Contracts	1.50%		1.70%
Total Contracts	2,101		2,331
Percentage of Portfolio Principal	1.30%		1.40%
Loan Principal	$ 20,421		$ 20,534

[1] Average FICO score is provided as an external metric of credit quality, but is generally not utilized to determine internal credit grade.