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Fair Value Measurements - Assets Measured at Fair Value on Non-Recurring Basis (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Impairment Losses |  |  |  |
Investment properties, continuing operations | $ 0 | $ 2,818,000 | $ 16,440,000 | $ 11,208,000
Nonrecurring |  |  |  |
Impairment Losses |  |  |  |
Investment properties, continuing operations | 0 | 2,818,000 | 16,440,000 | 11,208,000
Investment properties, discontinued operations | 0 | 0 | 0 | 106,514,000
Total | 0 | 2,818,000 | 16,440,000 | 117,722,000
Nonrecurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment properties, continuing operations | 0 | 27,173,000 | 36,676,000 | 66,323,000
Investment properties, discontinued operations | $ 0 | $ 0 | $ 0 | $ 584,358,000

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