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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, 2015 | Dec. 31, 2014 | Jun. 11, 2015 | May. 19, 2015
Derivative [Line Items] |  |  |  |  |  |
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 |  | 400,000,000 | [1],[2] |  |  | $ 325,000,000
Warehouse Facility II [Member] | 5.50% Cap Interest Rate [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Debt facility financing amount |  | $ 400,000,000 |  | $ 325,000,000 |  |
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 |  |  |  |
Notional |  |  |  | $ 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 |  | Aug. 01, 2011 |  |
End |  | Mar. 01, 2017 |  | Sep. 01, 2015 |  |
Notional |  | $ 75,000,000 |  | $ 29,300,000 |  |
Cap Interest Rate | [3] | 5.50% |  | 5.50% |  |
Warehouse Facility IV Member Starting March 2014 [Member] | 5.50% Cap Interest Rate [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Start |  |  |  | Mar. 01, 2014 |  |
End |  |  |  | Mar. 01, 2017 |  |
Notional |  |  |  | $ 45,700,000 |  |
Cap Interest Rate | [3] |  |  | 5.50% |  |
Warehouse Facility V [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Debt facility financing amount |  | $ 100,000,000 | [1],[2] |  | $ 75,000,000 |
Warehouse Facility V [Member] | 5.50% Cap Interest Rate [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Debt facility financing amount |  | $ 100,000,000 |  |  |  |
Start |  | Jun. 01, 2015 |  |  |  |
End |  | Jul. 01, 2018 |  |  |  |
Notional |  | $ 75,000,000 |  |  |  |
Cap Interest Rate | [3] | 5.50% |  |  |  |
Warehouse Facility V [Member] | 5.00% Cap Interest Rate [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Debt facility financing amount |  |  |  | $ 75,000,000 |  |
Start |  |  |  | Jun. 01, 2012 |  |
End |  |  |  | Jul. 01, 2015 |  |
Notional |  |  |  | $ 56,300,000 |  |
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 or the commercial paper rate, as applicable.

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