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Long-Term Debt - Additional Information (Details)
1 Months Ended 12 Months Ended
Sep. 30, 2014
USD ($)
Sep. 30, 2014
USD ($)
quarter
Sep. 30, 2021
Oct. 31, 2019
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]              
Repayments of long-term debt         $ 0 $ 0 $ 1,264,086,000
Series 2014-1 Class A-2 4.227% Fixed Rate Senior Secured Notes              
Debt Instrument [Line Items]              
Senior note interest rate 4.277% 4.277%     4.227%    
Quarterly principal payment         $ 3,250,000    
Number of quarters used in leverage ratio calculation | quarter   4          
Deferred finance costs $ 24,300,000 $ 24,300,000          
Amortization of financing costs         $ 3,200,000 $ 3,100,000 $ 700,000
Ratio of indebtedness to net capital         4.62    
Debt service coverage ratio         5.12    
Series 2014-1 Class A-2 4.227% Fixed Rate Senior Secured Notes | Maximum              
Debt Instrument [Line Items]              
Ratio of indebtedness to net capital         5.25    
Series 2014-1 Class A-2 4.227% Fixed Rate Senior Secured Notes | Forecast              
Debt Instrument [Line Items]              
Additional interest on fixed rate     5.00%        
Debt instrument, term     10 years        
Series 2014-1 Class A-2 4.227% Fixed Rate Senior Secured Notes | Forecast | Ten Year United States Treasury Bill Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate     2.15%        
Series 2014-1 Variable Funding Senior Notes Class A-1              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity $ 100,000,000 100,000,000          
Line of credit facility, amount outstanding         $ 0    
Line of credit facility, increase (decrease) in borrowing capacity         $ 5,000,000    
Series 2014-1 Variable Funding Senior Notes Class A-1 | Maximum              
Debt Instrument [Line Items]              
Line of credit facility, commitment fee percentage         1.00%    
Series 2014-1 Variable Funding Senior Notes Class A-1 | Minimum              
Debt Instrument [Line Items]              
Line of credit facility, commitment fee percentage         0.50%    
Series 2014-1 Variable Funding Senior Notes Class A-1 | LIBOR              
Debt Instrument [Line Items]              
Basis spread on variable rate 2.50%            
Series 2014-1 Variable Funding Senior Notes Class A-1 | Federal Funds Rate              
Debt Instrument [Line Items]              
Basis spread component of base rate 0.50%            
Series 2014-1 Variable Funding Senior Notes Class A-1 | One Month LIBOR              
Debt Instrument [Line Items]              
Basis spread component of base rate 0.50%            
Series 2014-1 Variable Funding Senior Notes Class A-1 | Base Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate 2.00%            
Series 2014-1 Variable Funding Senior Notes Class A-1 | Commercial Paper Funding Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate 2.50%            
Series 2014-1 Variable Funding Senior Notes Class A-1 | Forecast              
Debt Instrument [Line Items]              
Additional interest on variable rate       5.00%      
Amended Senior Secured Revolving Credit Facility              
Debt Instrument [Line Items]              
Quarterly principal payment   $ 463,600,000          
First Trigger | Series 2014-1 Class A-2 4.227% Fixed Rate Senior Secured Notes              
Debt Instrument [Line Items]              
Debt service coverage ratio, event trigger threshold         1.75    
Debt instrument, restrictive covenant, restriction on net cash flow         50.00%    
Second Trigger | Series 2014-1 Class A-2 4.227% Fixed Rate Senior Secured Notes              
Debt Instrument [Line Items]              
Debt service coverage ratio, event trigger threshold         1.5    
Debt instrument, restrictive covenant, restriction on net cash flow         100.00%    
Third Trigger | Series 2014-1 Class A-2 4.227% Fixed Rate Senior Secured Notes              
Debt Instrument [Line Items]              
Debt service coverage ratio, event trigger threshold         1.3    
Debt instrument, covenant violation description         Rapid Amortization    
Fourth Trigger | Series 2014-1 Class A-2 4.227% Fixed Rate Senior Secured Notes              
Debt Instrument [Line Items]              
Debt service coverage ratio, event trigger threshold         1.2    
Debt instrument, covenant violation description         Manager Termination    
Fifth Trigger | Series 2014-1 Class A-2 4.227% Fixed Rate Senior Secured Notes              
Debt Instrument [Line Items]              
Debt service coverage ratio, event trigger threshold         1.1    
Debt instrument, covenant violation description         Default