Finance Receivables Concentration of Credit Risk (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Concentration Risk [Line Items]
Percent of Portfolio	100.00%	100.00%
Loan Principal	$ 1,707,051	$ 1,601,710	$ 1,566,492
TEXAS [Member]
Concentration Risk [Line Items]
Percent of Portfolio	22.40%	23.00%
Loan Principal	384,359	369,021
FLORIDA [Member]
Concentration Risk [Line Items]
Percent of Portfolio	15.20%	15.40%
Loan Principal	261,348	247,281
NORTH CAROLINA [Member]
Concentration Risk [Line Items]
Percent of Portfolio	9.60%	9.90%
Loan Principal	163,058	157,670
GEORGIA [Member]
Concentration Risk [Line Items]
Percent of Portfolio	7.70%	7.60%
Loan Principal	130,818	122,027
VIRGINIA [Member]
Concentration Risk [Line Items]
Percent of Portfolio	6.50%	6.70%
Loan Principal	110,887	106,749
ARIZONA [Member]
Concentration Risk [Line Items]
Percent of Portfolio	6.40%	6.80%
Loan Principal	108,947	108,792
TENNESSEE [Member]
Concentration Risk [Line Items]
Percent of Portfolio	4.90%	4.60%
Loan Principal	83,020	72,967
CALIFORNIA [Member]
Concentration Risk [Line Items]
Percent of Portfolio	4.40%	4.40%
Loan Principal	75,524	71,005
NEVADA [Member]
Concentration Risk [Line Items]
Percent of Portfolio	3.80%	4.00%
Loan Principal	64,948	63,346
SOUTH CAROLINA [Member]
Concentration Risk [Line Items]
Percent of Portfolio	3.70%	3.60%
Loan Principal	63,827	58,163
ALABAMA [Member]
Concentration Risk [Line Items]
Percent of Portfolio	3.10%	2.80%
Loan Principal	53,224	44,787
NEW MEXICO [Member]
Concentration Risk [Line Items]
Percent of Portfolio	2.90%	3.00%
Loan Principal	48,745	48,421
OKLAHOMA [Member]
Concentration Risk [Line Items]
Percent of Portfolio	2.30%	2.30%
Loan Principal	38,703	36,109
COLORADO [Member]
Concentration Risk [Line Items]
Percent of Portfolio	2.10%	2.20%
Loan Principal	35,458	35,268
OHIO [Member]
Concentration Risk [Line Items]
Percent of Portfolio	1.70%	1.10%
Loan Principal	28,409	17,417
INDIANA [Member]
Concentration Risk [Line Items]
Percent of Portfolio	1.40%	1.30%
Loan Principal	24,084	21,603
MISSISSIPPI [Member]
Concentration Risk [Line Items]
Percent of Portfolio	1.10%	1.00%
Loan Principal	19,371	15,847
ARKANSAS [Member]
Concentration Risk [Line Items]
Percent of Portfolio	0.40%	0.20%
Loan Principal	6,252	3,218
MISSOURI [Member]
Concentration Risk [Line Items]
Percent of Portfolio	0.40%	0.10%
Loan Principal	$ 6,069	$ 2,019