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Fair Value Measurements - Non-Recurring Measurements (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Impairment Loss |  |  |
Investment properties, continuing operations, total impairment loss | $ 27,754 | $ 11,208 | $ 108,154
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Impairment Loss |  |  |
Investment properties, continuing operations, total impairment loss | 27,754 | 11,208 | 108,154
Investment properties, discontinued operations, total impairment loss | 0 | 106,514 | 0
Total Impairment Losses (Gain) | 27,754 | 117,722 | 108,154
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value |  |  |
Investment properties, continuing operations | 105,900 | 66,323 | 126,842
Investment properties, discontinued operations | $ 0 | $ 584,358 | $ 0

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