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Fair Value Measurements - Assets Measured at Fair Value on Non-Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Impairment Losses |  |
Investment properties | $ 797 | $ 16,440
Nonrecurring |  |
Impairment Losses |  |
Investment properties | 797 | 16,440
Nonrecurring | Level 3 |  |
Impairment Losses |  |
Investment properties | $ 31,000 | $ 36,676

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