Annual report pursuant to Section 13 and 15(d)

Debt (Receivable-Backed Notes Payable) (Details)

v3.8.0.1
Debt (Receivable-Backed Notes Payable) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jun. 06, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Receivable-backed notes payable - recourse $ 84,697   $ 87,631
Unamortized debt issuance costs (8,088)    
Receivable backed notes payable - non-recourse 336,421   327,358
Total receivable-backed debt 421,118   414,989
Principal Balance of Pledged/Secured Receivables 480,374   477,826
Recourse Receivable Backed Notes Payable [Member]      
Debt Instrument [Line Items]      
Receivable-backed notes payable - recourse 84,697   87,631
Principal Balance of Pledged/Secured Receivables 103,718   109,832
Non-Recourse Receivable Backed Notes Payable [Member]      
Debt Instrument [Line Items]      
Unamortized debt issuance costs (6,148)   (5,190)
Receivable backed notes payable - non-recourse 336,421   327,358
Principal Balance of Pledged/Secured Receivables 376,656   367,994
Liberty Bank Facility [Member] | Recourse Receivable Backed Notes Payable [Member]      
Debt Instrument [Line Items]      
Receivable-backed notes payable - recourse $ 24,990   $ 32,674
Interest Rate 5.00%   4.25%
Principal Balance of Pledged/Secured Receivables $ 30,472   $ 41,357
NBA Receivables Facility [Member] | Recourse Receivable Backed Notes Payable [Member]      
Debt Instrument [Line Items]      
Receivable-backed notes payable - recourse $ 44,414   34,164
Interest Rate 4.10%    
Principal Balance of Pledged/Secured Receivables $ 53,730   40,763
Pacific Western Facility [Member] | Recourse Receivable Backed Notes Payable [Member]      
Debt Instrument [Line Items]      
Receivable-backed notes payable - recourse $ 15,293   $ 20,793
Interest Rate 6.00%   5.14%
Principal Balance of Pledged/Secured Receivables $ 19,516   $ 27,712
KeyBank/DZ Purchase Facility [Member] | Non-Recourse Receivable Backed Notes Payable [Member]      
Debt Instrument [Line Items]      
Receivable backed notes payable - non-recourse $ 16,144   $ 31,417
Interest Rate 4.31%   3.67%
Principal Balance of Pledged/Secured Receivables $ 19,866   $ 41,388
Quorum Purchase Facility [Member] | Non-Recourse Receivable Backed Notes Payable [Member]      
Debt Instrument [Line Items]      
Receivable backed notes payable - non-recourse 16,771   23,981
Principal Balance of Pledged/Secured Receivables 18,659   26,855
2010 Term Securitization [Member] | Non-Recourse Receivable Backed Notes Payable [Member]      
Debt Instrument [Line Items]      
Receivable backed notes payable - non-recourse     $ 13,163
Interest Rate     5.54%
Principal Balance of Pledged/Secured Receivables     $ 16,191
2012 Term Securitization [Member] | Non-Recourse Receivable Backed Notes Payable [Member]      
Debt Instrument [Line Items]      
Receivable backed notes payable - non-recourse $ 23,227   $ 32,929
Interest Rate 2.94%   2.94%
Principal Balance of Pledged/Secured Receivables $ 25,986   $ 36,174
2013 Term Securitization [Member] | Non-Recourse Receivable Backed Notes Payable [Member]      
Debt Instrument [Line Items]      
Receivable backed notes payable - non-recourse $ 37,163   $ 48,514
Interest Rate 3.20%   3.20%
Principal Balance of Pledged/Secured Receivables $ 39,510   $ 51,157
2015 Term Securitization [Member] | Non-Recourse Receivable Backed Notes Payable [Member]      
Debt Instrument [Line Items]      
Receivable backed notes payable - non-recourse $ 58,498   $ 75,011
Interest Rate 3.02%   3.02%
Principal Balance of Pledged/Secured Receivables $ 61,705   $ 78,980
2016 Term Securitization [Member] | Non-Recourse Receivable Backed Notes Payable [Member]      
Debt Instrument [Line Items]      
Receivable backed notes payable - non-recourse $ 83,142   $ 107,533
Interest Rate 3.35%   3.35%
Principal Balance of Pledged/Secured Receivables $ 91,348   $ 117,249
2017 Term Securitization [Member]      
Debt Instrument [Line Items]      
Interest Rate   3.12%  
2017 Term Securitization [Member] | Non-Recourse Receivable Backed Notes Payable [Member]      
Debt Instrument [Line Items]      
Receivable backed notes payable - non-recourse $ 107,624    
Interest Rate 3.12%    
Principal Balance of Pledged/Secured Receivables $ 119,582    
Minimum [Member] | NBA Receivables Facility [Member] | Recourse Receivable Backed Notes Payable [Member]      
Debt Instrument [Line Items]      
Interest Rate     3.50%
Minimum [Member] | Quorum Purchase Facility [Member] | Non-Recourse Receivable Backed Notes Payable [Member]      
Debt Instrument [Line Items]      
Interest Rate     4.75%
Maximum [Member] | NBA Receivables Facility [Member] | Recourse Receivable Backed Notes Payable [Member]      
Debt Instrument [Line Items]      
Interest Rate     4.00%
Maximum [Member] | Quorum Purchase Facility [Member] | Non-Recourse Receivable Backed Notes Payable [Member]      
Debt Instrument [Line Items]      
Interest Rate     6.90%