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Subsequent Events Subsequent Events (Details) - USD ($)
 3 Months Ended
Apr. 28, 2017
Mar. 31, 2017
Dec. 31, 2016
Subsequent Event [Line Items]      
Debt facility financing amount   $ 2,924,200,000 $ 2,622,100,000
Warehouse Facility IV [Member]      
Subsequent Event [Line Items]      
Debt facility financing amount [1],[2]   $ 75,000,000  
Warehouse Facility IV [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Debt facility financing amount [1],[2] $ 100,000,000.0    
LIBOR [Member] | Warehouse Facility IV [Member]      
Subsequent Event [Line Items]      
Debt Instrument, Basis Spread on Variable Rate [1],[3]   2.00%  
LIBOR [Member] | Warehouse Facility IV [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Debt Instrument, Basis Spread on Variable Rate [1],[3] 2.25%    
[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] Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date based on the cash flows of the pledged assets.