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Borrowings - Schedule of Other Secured Borrowings (Footnote) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 18, 2019
Mar. 31, 2019
Dec. 31, 2018
Feb. 04, 2019
May 31, 2018
Dec. 05, 2016
Debt Instrument [Line Items]            
Available borrowing capacity   $ 66,100,000        
Proceeds from additional borrowings on SSTL $ 120,000,000          
Amended Senior Secured Term Loan [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity   455,000,000       $ 335,000,000
Periodic prepayment of SSTL   6,400,000 $ 4,200,000      
Repurchase Agreements [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 100,000,000 $ 175,000,000      
Participation Agreement [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity       $ 300,000,000    
London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Basis spread on variable rate   2.49% 2.50%      
Senior Secured Notes [Member] | Participation Agreement [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 175,000,000        
Senior Secured Notes [Member] | Mortgage Loan Warehouse Agreement [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 100,000,000        
Beneficial interest   100.00%        
Senior Secured Notes [Member] | Master Repurchase Agreement [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 250,000,000        
Beneficial interest   100.00%        
Borrowings available on committed basis   $ 200,000,000        
Senior Secured Notes [Member] | Master Repurchase Agreement [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity   50,000,000.0        
Senior Secured Notes [Member] | Master Repurchase Agreement [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 200,000,000.0        
Senior Secured Notes [Member] | Participation Agreement [Member]            
Debt Instrument [Line Items]            
Beneficial interest   100.00%        
Senior Secured Notes [Member] | Senior Secured Term Loan Option One [Member] | Federal Funds Rate [Member]            
Debt Instrument [Line Items]            
Basis spread on variable rate   0.50%        
Senior Secured Notes [Member] | Senior Secured Term Loan Option One [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Basis spread on variable rate   4.00%        
Senior Secured Notes [Member] | Senior Secured Term Loan Option One [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Basis spread on variable rate   2.00%        
Senior Secured Notes [Member] | Senior Secured Term Loan Option Two [Member] | Eurodollar [Member]            
Debt Instrument [Line Items]            
Basis spread on variable rate   5.00%        
Senior Secured Notes [Member] | Senior Secured Term Loan Option Two [Member] | Eurodollar Floor [Member]            
Debt Instrument [Line Items]            
Basis spread on variable rate   1.00%        
Mortgage Loan Warehouse Facility [Member]            
Debt Instrument [Line Items]            
Available borrowing capacity   $ 89,000,000        
May 31, 2019 Maturity [Member] | Senior Secured Notes [Member] | Participation Agreement [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity         $ 75,000,000.0