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Fair Value Measurements - Assets Measured at Fair Value on Non-Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Impairment Losses |  |  |  |
Investment properties | $ 2,359 | $ 2,713 | $ 2,359 | $ 3,510
Nonrecurring |  |  |  |
Impairment Losses |  |  |  |
Investment properties | 2,359 | 2,713 | 2,359 | 3,510
Nonrecurring | Level 3 |  |  |  |
Impairment Losses |  |  |  |
Investment properties | $ 42,250 | $ 33,075 | $ 42,250 | $ 64,075

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