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Borrowings - Schedule of Other Secured Borrowings (Footnote) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Apr. 20, 2017
Dec. 05, 2016
Nov. 20, 2015
Debt Instrument [Line Items]          
Available borrowing capacity $ 0        
Percentage of equity interest in foreign subsidiaries pledged as security to secured debt 35.00%        
Mortgage Warehouse Agreement [Member]          
Debt Instrument [Line Items]          
Available borrowing capacity $ 800,000        
Amended Senior Secured Term Loan [Member]          
Debt Instrument [Line Items]          
Periodic prepayment of SSTL $ 4,200,000        
Maximum borrowing capacity       $ 335,000,000  
Face amount       $ 100,000,000  
Repurchase Agreements [Member]          
Debt Instrument [Line Items]          
Percentage of maximum borrowing available on committed basis 50.00%        
Percentage of maximum borrowing available at discretion of lender 50.00%        
Repurchase Agreement [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity         $ 100,000,000
Secured Debt [Member] | Lending [Member] | Mortgage Warehouse Agreement [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 110,000,000        
Secured Debt [Member] | Lending [Member] | Master Repurchase Agreement [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity 200,000,000        
Secured Debt [Member] | Lending [Member] | Participation Agreement [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 250,000,000        
Beneficial interest 100.00%        
Secured Debt [Member] | Lending [Member] | Master Repurchase Agreement [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 100,000,000        
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 2.00%        
Warehouse Agreement Borrowings [Member] | Participation Agreement [Member]          
Debt Instrument [Line Items]          
Beneficial interest   100.00%      
Subsequent Event [Member] | Secured Debt [Member] | Lending [Member] | Mortgage Warehouse Agreement [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity     $ 20,000,000.0