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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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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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