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Debt Obligations, net - Unsecured Notes Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Nov. 30, 2019 | Oct. 31, 2019 | Sep. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  | $ 0 | $ 0 | $ 4,115,000 | $ 468,000 |  |  |
Unsecured notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  | $ 4,100,000 |  |  |  |
Unsecured notes | 4.75% Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 100,000,000.0 |  | $ 675,000,000.0
Stated interest rates (as a percent) |  |  | 4.75% |  | 4.75% |  | 4.75% |  | 4.75%
Percentage of par |  |  |  |  |  |  | 102.00% |  |
Yield to maturity |  |  |  |  |  |  | 4.29% |  |
Unsecured notes | 4.625% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 400,000,000.0 |
Stated interest rates (as a percent) |  |  |  |  |  |  |  | 4.625% |
Unsecured notes | 6.50% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 275,000,000.0 |
Stated interest rates (as a percent) |  |  |  |  |  |  |  | 6.50% |
Unsecured notes | 4.25% Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 550,000,000.0 |  |  |  |  |  |  |
Stated interest rates (as a percent) |  | 4.25% | 4.25% |  | 4.25% |  |  |  |
Principal amount redeemed |  | $ 375,000,000.0 |  |  |  |  |  |  |
Unsecured notes | 6.00% Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rates (as a percent) |  | 6.00% | 6.00% |  | 6.00% |  |  |  |
Principal amount redeemed | $ 110,500,000 |  |  |  |  |  |  |  |

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