4. Securitization Trust Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]
Receivables Pledged at end of period	$ 825,389
Initial Principal	1,474,617
Outstanding Principal	901,679	792,597
CPS 2008-A [Member]
Schedule of Held-to-maturity Securities [Line Items]
Final Scheduled Payment Date (1)	Oct-14
Receivables Pledged at end of period	14,094
Initial Principal	310,359
Outstanding Principal	35,652	40,713
Weighted Average Contractual Interest Rate at March 31, 2013	9.05%
Page Five Funding [Member]
Schedule of Held-to-maturity Securities [Line Items]
Final Scheduled Payment Date (1)	Jan-18
Receivables Pledged at end of period	19,076
Initial Principal	46,058
Outstanding Principal	18,151	21,251
Weighted Average Contractual Interest Rate at March 31, 2013	9.43%
CPS 2011-A [Member]
Schedule of Held-to-maturity Securities [Line Items]
Final Scheduled Payment Date (1)	Apr-18
Receivables Pledged at end of period	44,425
Initial Principal	100,364
Outstanding Principal	41,667	48,368
Weighted Average Contractual Interest Rate at March 31, 2013	3.83%
CPS 2011-B [Member]
Schedule of Held-to-maturity Securities [Line Items]
Final Scheduled Payment Date (1)	Sep-18
Receivables Pledged at end of period	65,808
Initial Principal	109,936
Outstanding Principal	64,791	70,863
Weighted Average Contractual Interest Rate at March 31, 2013	4.65%
CPS 2011-C [Member]
Schedule of Held-to-maturity Securities [Line Items]
Final Scheduled Payment Date (1)	Mar-19
Receivables Pledged at end of period	80,190
Initial Principal	119,400
Outstanding Principal	80,772	88,269
Weighted Average Contractual Interest Rate at March 31, 2013	5.07%
CPS 2012-A [Member]
Schedule of Held-to-maturity Securities [Line Items]
Final Scheduled Payment Date (1)	Jun-19
Receivables Pledged at end of period	93,543
Initial Principal	155,000
Outstanding Principal	95,319	105,485
Weighted Average Contractual Interest Rate at March 31, 2013	3.64%
CPS 2012-B [Member]
Schedule of Held-to-maturity Securities [Line Items]
Final Scheduled Payment Date (1)	Sept-19
Receivables Pledged at end of period	118,141
Initial Principal	141,500
Outstanding Principal	111,772	122,329
Weighted Average Contractual Interest Rate at March 31, 2013	3.14%
CPS 2012-C [Member]
Schedule of Held-to-maturity Securities [Line Items]
Final Scheduled Payment Date (1)	Dec-19
Receivables Pledged at end of period	127,147
Initial Principal	147,000
Outstanding Principal	122,001	135,219
Weighted Average Contractual Interest Rate at March 31, 2013	2.45%
CPS 2012-D [Member]
Schedule of Held-to-maturity Securities [Line Items]
Final Scheduled Payment Date (1)	Mar-20
Receivables Pledged at end of period	148,404
Initial Principal	160,000
Outstanding Principal	146,604	160,000
Weighted Average Contractual Interest Rate at March 31, 2013	2.00%
CPS 2013-A [Member]
Schedule of Held-to-maturity Securities [Line Items]
Final Scheduled Payment Date (1)	Jun-20
Receivables Pledged at end of period	114,561
Initial Principal	185,000
Outstanding Principal	$ 185,000
Weighted Average Contractual Interest Rate at March 31, 2013	1.77%