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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.

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