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Derivative and Hedging Instruments (Schedule of Terms of Interest Rate Cap Agreements) (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Oct. 27, 2016
 [1]
Derivative [Line Items]      
Debt facility financing amount $ 2,528,200,000 $ 2,086,300,000 $ 350,000,000
Interest rate caps, fair value of less than $0.1 million 100,000 100,000  
Warehouse Facility II [Member]      
Derivative [Line Items]      
Debt facility financing amount [1],[2] 400,000,000    
Warehouse Facility II [Member] | 5.50% Cap Interest Rate [Member]      
Derivative [Line Items]      
Debt facility financing amount $ 400,000,000 $ 400,000,000  
Start Dec. 01, 2014 Dec. 01, 2014  
End Jun. 01, 2016 Jun. 01, 2016  
Notional $ 325,000,000 $ 325,000,000  
Cap Interest Rate [3] 5.50% 5.50%  
Warehouse Facility IV [Member]      
Derivative [Line Items]      
Debt facility financing amount [1],[2] $ 75,000,000    
Warehouse Facility IV [Member] | 5.50% Cap Interest Rate [Member]      
Derivative [Line Items]      
Debt facility financing amount $ 75,000,000 $ 75,000,000  
Start Mar. 01, 2014 Mar. 01, 2014  
End Mar. 01, 2017 Mar. 01, 2017  
Notional $ 75,000,000 $ 75,000,000  
Cap Interest Rate [3] 5.50% 5.50%  
Warehouse Facility IV [Member] | 5.50% Cap Interest Rate Original [Member]      
Derivative [Line Items]      
Notional $ 37,500,000    
Warehouse Facility IV [Member] | 5.50% Cap Interest Rate Additional [Member]      
Derivative [Line Items]      
Notional 37,500,000    
Warehouse Facility V [Member]      
Derivative [Line Items]      
Debt facility financing amount [1],[2] 100,000,000    
Warehouse Facility V [Member] | 5.50% Cap Interest Rate [Member]      
Derivative [Line Items]      
Debt facility financing amount $ 100,000,000 $ 100,000,000  
Start Jun. 01, 2015 Jun. 01, 2015  
End Jul. 01, 2018 Jul. 01, 2018  
Notional $ 75,000,000 $ 75,000,000  
Cap Interest Rate [3] 5.50% 5.50%  
Term ABS 2016-1 [Member]      
Derivative [Line Items]      
Debt facility financing amount [1] $ 385,000,000    
Term ABS 2016-1 [Member] | 5.00% Cap Interest Rate [Member]      
Derivative [Line Items]      
Debt facility financing amount $ 385,000,000    
Start Apr. 15, 2016    
End Feb. 15, 2019    
Notional $ 385,000,000    
Cap Interest Rate [3] 5.00%    
[1] Financing made available only to a specified subsidiary of the Company.
[2] Interest rate cap agreements are in place to limit the exposure to increasing interest rates.
[3] Rate excludes the spread over the LIBOR rate.