Quarterly report pursuant to Section 13 or 15(d)

Debt (Receivable-Backed Notes Payable) (Details)

v3.8.0.1
Debt (Receivable-Backed Notes Payable) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Receivable-backed notes payable - recourse $ 86,310 $ 84,697 [1]
Receivable backed notes payable - non-recourse 327,024 336,421 [1]
Total receivable-backed debt 413,334 421,118
Principal Balance of Pledged/Secured Receivables 478,170 480,374
Recourse Receivable Backed Notes Payable [Member]    
Debt Instrument [Line Items]    
Principal Balance of Pledged/Secured Receivables 108,241 103,718
Non-Recourse Receivable Backed Notes Payable [Member]    
Debt Instrument [Line Items]    
Unamortized debt issuance costs (5,746) (6,148)
Principal Balance of Pledged/Secured Receivables 369,929 376,656
Liberty Bank Facility [Member]    
Debt Instrument [Line Items]    
Receivable-backed notes payable - recourse $ 22,375 $ 24,990
Interest Rate 5.00% 5.00%
Liberty Bank Facility [Member] | Recourse Receivable Backed Notes Payable [Member]    
Debt Instrument [Line Items]    
Principal Balance of Pledged/Secured Receivables $ 27,395 $ 30,472
NBA Receivables Facility [Member]    
Debt Instrument [Line Items]    
Receivable-backed notes payable - recourse $ 47,312 $ 44,414
Interest Rate 4.40% 4.10%
NBA Receivables Facility [Member] | Recourse Receivable Backed Notes Payable [Member]    
Debt Instrument [Line Items]    
Principal Balance of Pledged/Secured Receivables $ 59,647 $ 53,730
Pacific Western Facility [Member]    
Debt Instrument [Line Items]    
Receivable-backed notes payable - recourse $ 16,623 $ 15,293
Interest Rate 6.30% 6.00%
Pacific Western Facility [Member] | Recourse Receivable Backed Notes Payable [Member]    
Debt Instrument [Line Items]    
Principal Balance of Pledged/Secured Receivables $ 21,199 $ 19,516
KeyBank/DZ Purchase Facility [Member]    
Debt Instrument [Line Items]    
Receivable backed notes payable - non-recourse $ 21,904 $ 16,144
Interest Rate 4.63% 4.31%
KeyBank/DZ Purchase Facility [Member] | Non-Recourse Receivable Backed Notes Payable [Member]    
Debt Instrument [Line Items]    
Principal Balance of Pledged/Secured Receivables $ 27,112 $ 19,866
Quorum Purchase Facility [Member]    
Debt Instrument [Line Items]    
Receivable backed notes payable - non-recourse 21,689 16,771
Quorum Purchase Facility [Member] | Non-Recourse Receivable Backed Notes Payable [Member]    
Debt Instrument [Line Items]    
Principal Balance of Pledged/Secured Receivables 24,453 18,659
2012 Term Securitization [Member]    
Debt Instrument [Line Items]    
Receivable backed notes payable - non-recourse $ 21,058 $ 23,227
Interest Rate 2.94% 2.94%
2012 Term Securitization [Member] | Non-Recourse Receivable Backed Notes Payable [Member]    
Debt Instrument [Line Items]    
Principal Balance of Pledged/Secured Receivables $ 23,555 $ 25,986
2013 Term Securitization [Member]    
Debt Instrument [Line Items]    
Receivable backed notes payable - non-recourse $ 34,627 $ 37,163
Interest Rate 3.20% 3.20%
2013 Term Securitization [Member] | Non-Recourse Receivable Backed Notes Payable [Member]    
Debt Instrument [Line Items]    
Principal Balance of Pledged/Secured Receivables $ 37,316 $ 39,510
2015 Term Securitization [Member]    
Debt Instrument [Line Items]    
Receivable backed notes payable - non-recourse $ 54,667 $ 58,498
Interest Rate 3.02% 3.02%
2015 Term Securitization [Member] | Non-Recourse Receivable Backed Notes Payable [Member]    
Debt Instrument [Line Items]    
Principal Balance of Pledged/Secured Receivables $ 58,234 $ 61,705
2016 Term Securitization [Member]    
Debt Instrument [Line Items]    
Receivable backed notes payable - non-recourse $ 77,979 $ 83,142
Interest Rate 3.35% 3.35%
2016 Term Securitization [Member] | Non-Recourse Receivable Backed Notes Payable [Member]    
Debt Instrument [Line Items]    
Principal Balance of Pledged/Secured Receivables $ 86,230 $ 91,348
2017 Term Securitization [Member]    
Debt Instrument [Line Items]    
Receivable backed notes payable - non-recourse $ 100,846 $ 107,624
Interest Rate 3.12% 3.12%
2017 Term Securitization [Member] | Non-Recourse Receivable Backed Notes Payable [Member]    
Debt Instrument [Line Items]    
Principal Balance of Pledged/Secured Receivables $ 113,029 $ 119,582
Minimum [Member] | NBA Receivables Facility [Member]    
Debt Instrument [Line Items]    
Interest Rate 4.40% 4.10%
Minimum [Member] | Quorum Purchase Facility [Member]    
Debt Instrument [Line Items]    
Interest Rate 4.75% 4.75%
Maximum [Member] | Quorum Purchase Facility [Member]    
Debt Instrument [Line Items]    
Interest Rate 6.90% 6.90%
[1] See Note 1 for a summary of adjustments.