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Debt Obligations, net - Unsecured Notes Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Loss on early extinguishment of debt | $ 468 | $ 372 |
Unsecured notes | 5.00% senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rates (as a percent) | 5.00% |  | 5.00%
Loss on early extinguishment of debt | $ 500 |  |

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