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Debt (Narrative) (Details) |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 30, 2015 USD ($) | Feb. 21, 2014 USD ($) | Jan. 22, 2014 USD ($) | Dec. 31, 2018 USD ($) facility | Dec. 31, 2017 USD ($) | Sep. 30, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum hedging reserve |  |  |  |  | $ 1,000,000 |  |  |
Percentage of collections on contributed loans |  |  |  |  | 6.00% |  |  |
Monthly servicing fee per financing |  |  |  |  | 6.00% |  |  |
Debt covenants |  |  |  |  | $ 1 |  |  |
LineofCreditTwoThousandNineteen [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility |  |  |  |  | $ 315,000,000 |  |  |
Revolving Secured Line Of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maturity date |  |  |  |  | Jun. 22, 2021 |  |  |
Line of credit facility | [1] |  |  |  | $ 350,000,000 |  |  |
Percentage of net book value of loans |  |  |  |  | 80.00% |  |  |
Revolving Secured Line of Credit Future Maximum Borrowing Capacity [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility |  |  |  |  | $ 315,000,000 |  |  |
Warehouse Facilities [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of net book value of loans |  |  |  |  | 80.00% |  |  |
Number of warehouse facilities | facility |  |  |  |  | 5 |  |  |
Debt financing amount |  |  |  |  | $ 975,000,000 |  |  |
Warehouse Facility II [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maturity date | [2] |  |  |  | Dec. 20, 2020 |  |  |
Debt financing amount |  |  |  |  | $ 400,000,000 | [3] | $ 400,000,000 |
Interest rate |  |  |  |  | 0.00% |  | 0.00% |
Warehouse Facility IV [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maturity date | [2] |  |  |  | Apr. 30, 2020 |  |  |
Debt financing amount |  |  |  |  | $ 250,000,000 | [3] | $ 100,000,000 |
Interest rate |  |  |  |  | 0.00% |  | 0.00% |
Warehouse Facility V [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maturity date | [4] |  |  |  | Aug. 17, 2021 |  |  |
Debt financing amount |  |  |  |  | $ 100,000,000 | [3] | $ 100,000,000 |
Interest rate |  |  |  |  | 0.00% |  | 0.00% |
Warehouse Facility VI [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maturity date | [2] |  |  |  | Sep. 30, 2020 |  |  |
Debt financing amount |  |  |  |  | $ 75,000,000 |  |  |
Interest rate |  |  |  |  | 0.00% |  | 0.00% |
2017 Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes stated interest rate |  |  |  |  |  |  |  | 9.125%
Debt Instrument, Repurchase Date |  |  | Feb. 21, 2014 |  |  |  |  |
Repayments of senior notes |  |  | $ 350,000,000 |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 21,800,000 |  |  |  |  |
2021 Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  |  |  | Jan. 22, 2014 |  |  |  |
Debt maturity date |  |  |  | Feb. 15, 2021 | Feb. 15, 2021 |  |  |
Debt financing amount |  |  |  | $ 300,000,000 | $ 300,000,000 |  |  |
Senior notes stated interest rate |  |  |  | 6.125% |  |  |  |
Interest rate |  |  |  |  | 6.125% |  | 6.125% |
2023 Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | Mar. 30, 2015 |  |  |  |  |  |
Debt maturity date |  | Mar. 15, 2023 |  |  | Mar. 15, 2023 |  |  |
Debt financing amount |  | $ 250,000,000 |  |  | $ 250,000,000 |  |  |
Senior notes stated interest rate |  | 7.375% |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  | 99.266% |  |  |  |  |  |
Proceeds from issuance of senior notes |  | $ 248,200,000 |  |  |  |  |  |
Interest rate |  | 7.50% |  |  | 7.375% |  | 7.375% |
Mortgage [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  |  |  |  | Aug. 06, 2018 |  |  |
Debt maturity date |  |  |  |  | Aug. 06, 2023 |  |  |
Debt financing amount |  |  |  |  | $ 12,000,000 |  |  |
Interest rate |  |  |  |  | 3.85% |  | 0.00% |
London Interbank Offered Rate (LIBOR) [Member] | Revolving Secured Line Of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.875% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Warehouse Facility II [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.75% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Warehouse Facility IV [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.25% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Warehouse Facility V [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.90% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Warehouse Facility VI [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.00% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Mortgage [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.50% |  |  |
Prime Rate [Member] | Revolving Secured Line Of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 0.875% |  |  |
[1] | The amount of the facility will decrease to $315.0 million on June 22, 2019.
[2] | Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date based on the cash flows of the pledged assets.
[3] | Interest rate cap agreements are in place to limit the exposure to increasing interest rates.
[4] | Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date and any amounts remaining on August 17, 2023 will be due on that date.

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