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Fair Value Measurements - Interest Rate Caps (Details) - Level 2 - Interest rate caps - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative [Line Items] |  |
Current notional balance | $ 813,434 |
Weighted average fixed cap rate | 4.67% |
Estimated asset fair value (included in other assets, net) | $ 38 | $ 127

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