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3. Securitization Trust Debt (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2018	Dec. 31, 2017
"Securitization trust debt," and components of debt
Receivables Pledged at end of period		$ 2,134,806
Initial Principal		4,972,688
Outstanding Principal		$ 2,046,073	$ 2,095,675
CPS 2013-B [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	September 2020
Receivables Pledged at end of period		$ 0
Initial Principal		205,000
Outstanding Principal		$ 0	18,407
Weighted Average Contractual Interest Rate		0.00%
CPS 2013-C [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	December 2020
Receivables Pledged at end of period		$ 0
Initial Principal		205,000
Outstanding Principal		$ 0	25,559
Weighted Average Contractual Interest Rate		0.00%
CPS 2013-D [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	March 2021
Receivables Pledged at end of period		$ 0
Initial Principal		183,000
Outstanding Principal		$ 0	24,917
Weighted Average Contractual Interest Rate		0.00%
CPS 2014-A [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	June 2021
Receivables Pledged at end of period		$ 20,652
Initial Principal		180,000
Outstanding Principal		$ 18,447	30,521
Weighted Average Contractual Interest Rate		5.01%
CPS 2014-B [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	September 2021
Receivables Pledged at end of period		$ 30,370
Initial Principal		202,500
Outstanding Principal		$ 28,542	44,516
Weighted Average Contractual Interest Rate		4.23%
CPS 2014-C [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	December 2021
Receivables Pledged at end of period		$ 49,690
Initial Principal		273,000
Outstanding Principal		$ 47,685	71,174
Weighted Average Contractual Interest Rate		4.41%
CPS 2014-D [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	March 2022
Receivables Pledged at end of period		$ 55,838
Initial Principal		267,500
Outstanding Principal		$ 53,711	79,099
Weighted Average Contractual Interest Rate		4.74%
CPS 2015-A [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	June 2022
Receivables Pledged at end of period		$ 62,557
Initial Principal		245,000
Outstanding Principal		$ 60,077	87,194
Weighted Average Contractual Interest Rate		4.27%
CPS 2015-B [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	September 2022
Receivables Pledged at end of period		$ 74,678
Initial Principal		250,000
Outstanding Principal		$ 73,012	102,873
Weighted Average Contractual Interest Rate		4.26%
CPS 2015-C [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	December 2022
Receivables Pledged at end of period		$ 103,397
Initial Principal		300,000
Outstanding Principal		$ 102,156	141,362
Weighted Average Contractual Interest Rate		4.73%
CPS 2016-A [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	March 2023
Receivables Pledged at end of period		$ 135,737
Initial Principal		329,460
Outstanding Principal		$ 133,612	180,761
Weighted Average Contractual Interest Rate		4.99%
CPS 2016-B [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	June 2023
Receivables Pledged at end of period		$ 153,931
Initial Principal		332,690
Outstanding Principal		$ 149,522	201,199
Weighted Average Contractual Interest Rate		5.19%
CPS 2016-C [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	September 2023
Receivables Pledged at end of period		$ 154,934
Initial Principal		318,500
Outstanding Principal		$ 151,409	203,504
Weighted Average Contractual Interest Rate		4.85%
CPS 2016-D [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	April 2024
Receivables Pledged at end of period		$ 117,334
Initial Principal		206,325
Outstanding Principal		$ 114,540	149,671
Weighted Average Contractual Interest Rate		3.64%
CPS 2017-A [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	April 2024
Receivables Pledged at end of period		$ 127,389
Initial Principal		206,320
Outstanding Principal		$ 124,560	161,892
Weighted Average Contractual Interest Rate		3.79%
CPS 2017-B [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	December 2023
Receivables Pledged at end of period		$ 153,829
Initial Principal		225,170
Outstanding Principal		$ 140,756	186,594
Weighted Average Contractual Interest Rate		3.27%
CPS 2017-C [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	September 2024
Receivables Pledged at end of period		$ 156,928
Initial Principal		224,825
Outstanding Principal		$ 146,720	197,155
Weighted Average Contractual Interest Rate		3.19%
CPS 2017-D [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	June 2024
Receivables Pledged at end of period		$ 155,682
Initial Principal		196,300
Outstanding Principal		$ 146,842	189,277
Weighted Average Contractual Interest Rate		3.00%
CPS 2018-A [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	March 2025
Receivables Pledged at end of period		$ 164,281
Initial Principal		190,000
Outstanding Principal		$ 154,758	0
Weighted Average Contractual Interest Rate		3.05%
CPS 2018-B [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	December 2024
Receivables Pledged at end of period		$ 188,338
Initial Principal		201,823
Outstanding Principal		$ 180,508	0
Weighted Average Contractual Interest Rate		3.52%
CPS 2018-C [Member]
"Securitization trust debt," and components of debt
Final Scheduled Payment Date	[1]	September 2025
Receivables Pledged at end of period		$ 229,241
Initial Principal		230,275
Outstanding Principal		$ 219,216	$ 0
Weighted Average Contractual Interest Rate		3.60%
[1] The Final Scheduled Payment Date represents final legal maturity of the securitization trust debt. Securitization trust debt is expected to become due and to be paid prior to those dates, based on amortization of the finance receivables pledged to the trusts. Expected payments, which will depend on the performance of such receivables, as to which there can be no assurance, are $233.8 million in 2018, $853.1 million in 2019, $527.2 million in 2020, $272.2 million in 2021, $112.5 million in 2022, $35.5 million in 2023.

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Final Scheduled Payment Date

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Securitization Trust Debt Initial Principal

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Weighted average interest rate of debt outstanding.

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The fair value, as of the date of each statement of financial position presented, of finance receivables which are owned but transferred to serve as collateral for the payment of the related debt obligation, and that are reclassified and separately reported in the statement of financial position.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728

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This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107314-111719

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