(3) Securitization Trust Debt (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2020	Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Receivables Pledged at end of period	[1]	$ 2,214,788
Initial Principal		5,693,762
Outstanding Principal		2,063,166	$ 2,109,766
Expected finance receivable payments 2020		418,100
Expected finance receivable payments 2021		664,000
Expected finance receivable payments 2022		450,700
Expected finance receivable payments 2023		369,300
Expected finance receivable payments 2024		80,900
Expected finance receivable payments 2025		65,200
Expected finance receivable payments 2026		$ 3,000
CPS 2014-C [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	December 2021
Receivables Pledged at end of period	[1]	$ 0
Initial Principal		273,000
Outstanding Principal		$ 0	19,758
Weighted Average Contractual Interest Rate		0.00%
CPS 2014-D [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	March 2022
Receivables Pledged at end of period	[1]	$ 17,002
Initial Principal		267,500
Outstanding Principal		$ 15,647	23,755
Weighted Average Contractual Interest Rate		5.82%
CPS 2015-A [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	June 2022
Receivables Pledged at end of period	[1]	$ 18,894
Initial Principal		245,000
Outstanding Principal		$ 17,301	26,713
Weighted Average Contractual Interest Rate		5.87%
CPS 2015-B [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	September 2022
Receivables Pledged at end of period	[1]	$ 26,444
Initial Principal		250,000
Outstanding Principal		$ 26,142	36,338
Weighted Average Contractual Interest Rate		5.45%
CPS 2015-C [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	December 2022
Receivables Pledged at end of period	[1]	$ 39,594
Initial Principal		300,000
Outstanding Principal		$ 39,739	53,579
Weighted Average Contractual Interest Rate		6.17%
CPS 2016-A [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	March 2023
Receivables Pledged at end of period	[1]	$ 50,410
Initial Principal		329,460
Outstanding Principal		$ 53,801	71,599
Weighted Average Contractual Interest Rate		6.55%
CPS 2016-B [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	June 2023
Receivables Pledged at end of period	[1]	$ 62,854
Initial Principal		332,690
Outstanding Principal		$ 62,967	82,667
Weighted Average Contractual Interest Rate		7.08%
CPS 2016-C [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	September 2023
Receivables Pledged at end of period	[1]	$ 64,356
Initial Principal		318,500
Outstanding Principal		$ 63,748	83,696
Weighted Average Contractual Interest Rate		7.12%
CPS 2016-D [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	April 2024
Receivables Pledged at end of period	[1]	$ 51,487
Initial Principal		206,325
Outstanding Principal		$ 49,635	65,021
Weighted Average Contractual Interest Rate		5.31%
CPS 2017-A [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	April 2024
Receivables Pledged at end of period	[1]	$ 57,147
Initial Principal		206,320
Outstanding Principal		$ 54,980	71,450
Weighted Average Contractual Interest Rate		5.26%
CPS 2017-B [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	December 2023
Receivables Pledged at end of period	[1]	$ 70,008
Initial Principal		225,170
Outstanding Principal		$ 56,243	76,201
Weighted Average Contractual Interest Rate		4.57%
CPS 2017-C [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	September 2024
Receivables Pledged at end of period	[1]	$ 72,442
Initial Principal		224,825
Outstanding Principal		$ 61,597	80,315
Weighted Average Contractual Interest Rate		4.45%
CPS 2017-D [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	June 2024
Receivables Pledged at end of period	[1]	$ 74,749
Initial Principal		196,300
Outstanding Principal		$ 64,292	83,801
Weighted Average Contractual Interest Rate		4.01%
CPS 2018-A [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	March 2025
Receivables Pledged at end of period	[1]	$ 80,427
Initial Principal		190,000
Outstanding Principal		$ 70,616	91,258
Weighted Average Contractual Interest Rate		3.85%
CPS 2018-B [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	December 2024
Receivables Pledged at end of period	[1]	$ 94,479
Initial Principal		201,823
Outstanding Principal		$ 86,861	111,188
Weighted Average Contractual Interest Rate		4.25%
CPS 2018-C [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	September 2025
Receivables Pledged at end of period	[1]	$ 111,494
Initial Principal		230,275
Outstanding Principal		$ 100,415	130,064
Weighted Average Contractual Interest Rate		4.36%
CPS 2018-D [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	June 2025
Receivables Pledged at end of period	[1]	$ 131,159
Initial Principal		233,730
Outstanding Principal		$ 115,229	149,470
Weighted Average Contractual Interest Rate		4.35%
CPS 2019-A [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	March 2026
Receivables Pledged at end of period	[1]	$ 164,744
Initial Principal		254,400
Outstanding Principal		$ 147,634	186,900
Weighted Average Contractual Interest Rate		4.15%
CPS 2019-B [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	June 2026
Receivables Pledged at end of period	[1]	$ 159,841
Initial Principal		228,275
Outstanding Principal		$ 150,112	184,308
Weighted Average Contractual Interest Rate		3.74%
CPS 2019-C [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	September 2026
Receivables Pledged at end of period	[1]	$ 186,160
Initial Principal		243,513
Outstanding Principal		$ 177,905	216,650
Weighted Average Contractual Interest Rate		3.12%
CPS 2019-D [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	December 2026
Receivables Pledged at end of period	[1]	$ 232,484
Initial Principal		274,313
Outstanding Principal		$ 223,234	265,035
Weighted Average Contractual Interest Rate		2.68%
CPS 2020-A [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	March 2027
Receivables Pledged at end of period	[1]	$ 232,307
Initial Principal		260,000
Outstanding Principal		$ 228,045	0
Weighted Average Contractual Interest Rate		2.66%
CPS 2020-B [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Final Scheduled Payment Date	[2]	June 2027
Receivables Pledged at end of period	[1]	$ 216,306
Initial Principal		202,343
Outstanding Principal		$ 197,023	$ 0
Weighted Average Contractual Interest Rate		2.77%

[1] Includes repossessed assets that are included in Other assets on our Unaudited Condensed Consolidated Balance Sheet.

[2] 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 $418.1 million in 2020, $664.0 million in 2021, $450.7 million in 2022, $369.3 million in 2023, $80.9 million in 2024, $65.2 million in 2025, and $3.0 million in 2026.