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Derivative and Hedging Instruments (Schedule of Terms of Interest Rate Cap Agreements) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2015
Dec. 31, 2016
Derivative [Line Items]      
Debt facility financing amount $ 2,924,200,000   $ 2,622,100,000
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 Jun. 01, 2016  
End Jun. 01, 2016 Dec. 01, 2017  
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 Original [Member]      
Derivative [Line Items]      
Notional     $ 18,800,000
Cap Interest Rate [3]     5.50%
Warehouse Facility IV [Member] | 5.50% Cap Interest Rate Additional [Member]      
Derivative [Line Items]      
Notional     $ 56,200,000
Cap Interest Rate [3]     5.50%
Warehouse Facility IV [Member] | 5.50% Cap Interest Rate [Member]      
Derivative [Line Items]      
Debt facility financing amount $ 75,000,000   $ 75,000,000
Start Apr. 01, 2016 Mar. 01, 2014  
End Apr. 01, 2019 Mar. 01, 2017  
Notional $ 75,000,000   75,000,000
Cap Interest Rate [3] 5.50%    
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],[2] $ 385,000,000    
Term ABS 2016-1 [Member] | 5.00% Cap Interest Rate [Member]      
Derivative [Line Items]      
Debt facility financing amount 385,000,000.0   $ 385,000,000
Notional $ 385,000,000   $ 385,000,000
Cap Interest Rate [3] 5.00%   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.