CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities:
Net (loss) income	$ (15,181,000)	$ 33,324,000	$ 210,580,000
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Loss due to property damages	0	964,000	668,000
Casualty-related loss	506,000	0	0
Equity in (income) loss of unconsolidated entities	(6,621,000)	9,830,000	6,037,000
Depreciation and amortization	34,004,000	35,006,000	53,446,000
Other-than-temporary impairment of debt securities	0	2,500,000	0
(Gain) loss on real estate equity securities	(20,379,000)	19,010,000	0
Gain on real estate sale	(34,077,000)	(80,594,000)	(255,935,000)
Loss on extinguishment of debt	1,106,000	493,000	478,000
Subordinated performance fee due upon termination	32,640,000	0	0
Unrealized loss on interest rate caps	50,000	142,000	105,000
Deferred rent	(4,078,000)	(4,736,000)	(2,416,000)
Bad debt expense	0	161,000	724,000
Amortization of above- and below-market leases, net	(1,091,000)	(1,152,000)	(2,575,000)
Amortization of deferred financing costs	3,606,000	3,640,000	4,363,000
Interest accretion on real estate debt securities	(13,000)	(108,000)	(565,000)
Net amortization of (premium) and discount on bond and notes payable	(99,000)	61,000	49,000
Foreign currency transaction loss (gain), net	12,498,000	(10,141,000)	15,298,000
Changes in assets and liabilities:
Rents and other receivables	(1,548,000)	(1,801,000)	(1,810,000)
Prepaid expenses and other assets	(5,137,000)	(7,375,000)	(5,995,000)
Accounts payable and accrued liabilities	(2,334,000)	3,387,000	(4,270,000)
Due to affiliates	1,606,000	10,000	(29,000)
Other liabilities	386,000	(478,000)	(4,721,000)
Net cash (used in) provided by operating activities	(4,156,000)	2,143,000	13,432,000
Cash Flows from Investing Activities:
Acquisitions of real estate	90,266,000	312,348,000	165,465,000
Cash paid to acquire PORT, net of cash acquired	(46,864,000)	0	0
Improvements to real estate	(32,472,000)	(32,172,000)	(41,224,000)
Proceeds from sales of real estate, net	141,548,000	250,576,000	872,091,000
Reimbursement of construction costs	0	1,636,000	0
Insurance proceeds received for property damages	438,000	0	744,000
Purchase of interest rate caps	(28,000)	(163,000)	(107,000)
Purchase of foreign currency option	0	0	(3,434,000)
Proceeds from termination of foreign currency collars	0	0	6,557,000
Contributions to unconsolidated entities	(31,845,000)	(1,320,000)	0
Distribution of capital from unconsolidated entities	8,051,000	2,198,000	59,800,000
Investment in real estate equity securities	(15,224,000)	(30,609,000)	(43,308,000)
Proceeds from the sale of real estate equity securities	28,033,000	27,786,000	0
Investment in real estate debt securities, net	0	0	(12,514,000)
Proceeds from principal repayment on real estate debt securities	7,750,000	4,500,000	0
Proceeds for future development obligations	0	2,113,000	1,367,000
Funding of development obligations	(134,000)	(1,258,000)	(1,184,000)
Net cash (used in) provided by investing activities	(31,013,000)	(89,061,000)	673,323,000
Cash Flows from Financing Activities:
Proceeds from notes and bonds payable	84,268,000	223,425,000	187,204,000
Principal payments on notes and bonds payable	(126,603,000)	(152,516,000)	(477,089,000)
Payments of deferred financing costs	(1,123,000)	(3,391,000)	(2,396,000)
Payments to redeem common stock	(10,028,000)	(123,613,000)	(74,780,000)
Payment of prepaid other offering costs	(157,000)	(562,000)	(480,000)
Distributions paid	(886,000)	(70,980,000)	(7,229,000)
Noncontrolling interests contributions	13,000	762,000	158,000
Distributions to noncontrolling interests	(3,869,000)	0	(22,000)
Proceeds for noncontrolling preferred stock, net	15,008,000	0	0
Other financing proceeds, net	1,822,000	0	0
Net cash used in financing activities	(41,555,000)	(126,875,000)	(374,634,000)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,491,000	(662,000)	611,000
Net (decrease) increase in cash, cash equivalents and restricted cash	(74,233,000)	(214,455,000)	312,732,000
Cash, cash equivalents and restricted cash, beginning of period	162,727,000	377,182,000	64,450,000
Cash, cash equivalents and restricted cash, end of period	$ 88,494,000	$ 162,727,000	$ 377,182,000