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Fair Value Measurements - Interest Rate Caps (Details) - Level 2 - Interest rate caps - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative [Line Items] |  |
Current notional balance | $ 1,187,979 |
Weighted average fixed cap rate | 4.57% |
Estimated asset fair value (included in other assets, net) | $ 150 | $ 38

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