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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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