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BORROWINGS (Details 3) - USD ($)
1 Months Ended 3 Months Ended
Mar. 30, 2017
Nov. 15, 2016
Nov. 01, 2016
Jan. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Details of Company's borrowings              
Net gain (loss) on extinguishment of debt       $ 2,400,000 $ 2,415,000 $ 0  
Repayment of junior subordinated notes       $ 18,800,000 13,168,000 $ 0  
CLO 17 Warehouse Facility              
Details of Company's borrowings              
Maximum borrowing capacity     $ 200,000,000.0        
5.50% Senior unsecured notes              
Details of Company's borrowings              
Par amount of notes issued $ 375,000,000.0       $ 375,000,000    
Debt instrument, stated interest rate 5.50%       5.50%   5.50%
Proceeds from senior notes $ 368,600,000            
Redemption price as percentage 100.00%            
5.50% Senior unsecured notes | Treasury Rate              
Details of Company's borrowings              
Interest rate spread 0.50%            
8.375% Senior notes              
Details of Company's borrowings              
Par amount of notes issued   $ 258,800,000.0          
Debt instrument, stated interest rate   8.375%          
Net gain (loss) on extinguishment of debt   $ 29,800,000          
Minimum | CLO 17 Warehouse Facility | LIBOR              
Details of Company's borrowings              
Interest rate spread     1.25%        
Minimum | 5.50% Senior unsecured notes              
Details of Company's borrowings              
Days of redemption notification 30 days            
Maximum | CLO 17 Warehouse Facility | LIBOR              
Details of Company's borrowings              
Interest rate spread     2.20%        
Maximum | 5.50% Senior unsecured notes              
Details of Company's borrowings              
Days of redemption notification 60 days