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Debt Obligations, net (Unsecured Notes Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
Loss on early extinguishment of debt |  | $ 12,038 | $ 27,724
Unsecured notes |  |  |
Debt Instrument [Line Items] |  |  |
Loss on early extinguishment of debt |  | $ 12,000 | $ 26,600
Unsecured notes | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of principal amount of consenting notes paid as consent fees to note holders | 0.75% |  |
Unsecured notes | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of principal amount of consenting notes paid as consent fees to note holders | 1.00% |  |
Unsecured notes | 4.75% Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 4.75% |  |
Unsecured notes | 4.25% Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 4.25% |  |
Unsecured notes | 5.50% Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.50% |  |

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