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Derivative and Hedging Instruments (Schedule of Terms of Interest Rate Cap Agreements) (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Derivative [Line Items]    
Debt facility financing amount $ 2,557,400,000 $ 2,086,300,000
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 $ 56,200,000  
Warehouse Facility IV [Member] | 5.50% Cap Interest Rate Additional [Member]    
Derivative [Line Items]    
Notional 18,800,000  
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.