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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Impairment Losses |  |  |  |
Investment properties | $ 2,713 | $ 0 | $ 3,510 | $ 16,440
Nonrecurring |  |  |  |
Impairment Losses |  |  |  |
Investment properties | 2,713 | 0 | 3,510 | 16,440
Nonrecurring | Level 3 |  |  |  |
Impairment Losses |  |  |  |
Investment properties | $ 33,075 | $ 0 | $ 64,075 | $ 36,676

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