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Subsequent Events Subsequent Events (Details) - USD ($) $ in Millions |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 26, 2019 | Jul. 25, 2019 | Jul. 12, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Warehouse Facility II [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt facility financing amount | [1],[2] |  |  |  | $ 400.0 |  |
Debt maturity date | [1],[3] |  |  |  | Dec. 20, 2020 |  |
Warehouse Facility VI [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt facility financing amount | [1],[2] |  |  |  | $ 75.0 |  |
Debt maturity date | [1],[3] |  |  |  | Sep. 30, 2020 |  |
Warehouse Facility IV [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt facility financing amount |  |  |  |  | $ 250.0 | [1],[2] | $ 250.0
Debt maturity date | [1],[3] |  |  |  | Apr. 30, 2020 |  |
Subsequent Event [Member] | Warehouse Facility II [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt maturity date | [1],[3] |  |  | Jul. 12, 2022 |  |  |
Subsequent Event [Member] | Warehouse Facility VI [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt maturity date | [1],[3] |  | Sep. 30, 2022 |  |  |  |
Subsequent Event [Member] | Warehouse Facility IV [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt facility financing amount | [1],[2] | $ 300.0 |  |  |  |  |
Debt maturity date | [1],[3] | Jul. 26, 2022 |  |  |  |  |
Subsequent Event [Member] | Warehouse Facility VIII [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt facility financing amount | [1],[2] | $ 200.0 |  |  |  |  |
Debt maturity date | [1],[3] | Jul. 26, 2022 |  |  |  |  |
LIBOR [Member] | Warehouse Facility II [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | [1],[2] |  |  |  | 17500.00% |  |
LIBOR [Member] | Warehouse Facility VI [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | [1] |  |  |  | 20000.00% |  |
LIBOR [Member] | Warehouse Facility IV [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | [1],[2] |  |  |  | 22500.00% |  |
LIBOR [Member] | Subsequent Event [Member] | Warehouse Facility IV [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | [1],[2] | 20000.00% |  |  |  |  |
LIBOR [Member] | Subsequent Event [Member] | Warehouse Facility VIII [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | [1],[2] | 19000.00% |  |  |  |  |
[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] | Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date based on the cash flows of the pledged assets.

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