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Borrowings - Schedule of Other Secured Borrowings (Footnote) (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Dec. 05, 2016
Debt Instrument [Line Items]      
Available borrowing capacity $ 121,100,000    
Amended Senior Secured Term Loan [Member]      
Debt Instrument [Line Items]      
Face amount     $ 100,000,000
Percentage of equity interest in foreign subsidiaries pledged as security to secured debt 35.00%    
Periodic prepayment of SSTL $ 4,200,000    
Maximum borrowing capacity     $ 335,000,000
Repurchase Agreements [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 87,500,000 $ 137,500,000  
London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate [1] 2.60%    
Secured Debt [Member] | Participation Agreement [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 250,000,000    
Beneficial interest 100.00%    
Secured Debt [Member] | Mortgage Warehouse Agreement [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 100,000,000    
Beneficial interest 100.00%    
Secured Debt [Member] | Master Repurchase Agreement [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 150,000,000.0    
Beneficial interest 100.00%    
Secured Debt [Member] | Master Repurchase Agreement [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 50,000,000.0    
Secured Debt [Member] | Senior Secured Term Loan Option One [Member] | Federal Funds Rate [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.50%    
Secured Debt [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%    
Secured Debt [Member] | Senior Secured Term Loan Option One [Member] | Base Rate [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.00%    
Secured Debt [Member] | Senior Secured Term Loan Option Two [Member] | Eurodollar [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 5.00%    
Secured Debt [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 $ 59,900,000    
[1] Represents amounts due to the holders of beneficial interests in Ginnie Mae guaranteed HMBS. The beneficial interests have no maturity dates, and the borrowings mature as the related loans are repaid.