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Debt (Narrative) (Details) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 30, 2015 USD ($) | Feb. 21, 2014 USD ($) | Jan. 22, 2014 USD ($) | Dec. 31, 2016 USD ($) facility | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum hedging reserve |  |  |  |  | $ 1,000,000 |  |  |
Debt financing amount |  |  |  |  | $ 2,622,100,000 | $ 2,086,300,000 |  |
Percentage of collections on contributed loans |  |  |  |  | 6.00% |  |  |
Monthly servicing fee per financing |  |  |  |  | 6.00% |  |  |
Repayments of senior notes |  |  |  |  | $ 0 | 0 | $ 350,000,000 |
Loss on extinguishment of debt |  |  |  |  | 0 | 0 | (21,800,000) |
Debt covenants |  |  |  |  | 1 |  |  |
Proceeds from issuance of senior notes |  |  |  |  | $ 0 | 248,200,000 | $ 300,000,000 |
Revolving Secured Line Of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maturity date |  |  |  |  | Jun. 22, 2019 |  |  |
Line of credit facility |  |  |  |  | $ 310,000,000 |  |  |
Percentage of net book value of loans |  |  |  |  | 80.00% |  |  |
Debt financing amount | [1] |  |  |  | $ 0 | $ 57,700,000 |  |
Warehouse Facilities [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of net book value of loans |  |  |  |  | 80.00% |  |  |
Number of warehouse facilities | facility |  |  |  |  | 4 |  |  |
Debt financing amount |  |  |  |  | $ 650,000,000 |  |  |
Warehouse Facility II [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maturity date | [2],[3] |  |  |  | Jun. 23, 2019 |  |  |
Debt financing amount | [2],[4] |  |  |  | $ 400,000,000 |  |  |
Interest rate |  |  |  |  | 0.00% | 0.00% |  |
Warehouse Facility IV [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maturity date | [2],[3] |  |  |  | Apr. 30, 2018 |  |  |
Debt financing amount | [2],[4] |  |  |  | $ 75,000,000 |  |  |
Interest rate |  |  |  |  | 2.77% | 2.42% |  |
Warehouse Facility V [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maturity date | [2],[5] |  |  |  | Aug. 18, 2019 |  |  |
Debt financing amount | [2],[4] |  |  |  | $ 100,000,000 |  |  |
Interest rate |  |  |  |  | 0.00% | 0.00% |  |
Warehouse Facility VI [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maturity date | [2],[3] |  |  |  | Sep. 30, 2018 |  |  |
Debt financing amount | [2] |  |  |  | $ 75,000,000 |  |  |
Interest rate |  |  |  |  | 0.00% | 2.24% |  |
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% |  |
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 |  |  |  |  | 2.00% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Warehouse Facility IV [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.00% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Warehouse Facility V [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.60% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Warehouse Facility VI [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.00% |  |  |
Prime Rate [Member] | Revolving Secured Line Of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 0.875% |  |  |
[1] | Excludes deferred debt issuance costs of $2.4 million and $2.2 million as of December 31, 2016 and December 31, 2015, respectively, which are included in other assets.
[2] | Financing made available only to a specified subsidiary of the Company.
[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.
[4] | Interest rate cap agreements are in place to limit the exposure to increasing interest rates.
[5] | Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date and any amounts remaining on August 18, 2021 will be due on that date.

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