CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
CASH FLOW FROM OPERATING ACTIVITIES
Net income (loss)	$ (10,602)	$ (34,867)	$ 5,599	$ (67,711)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Equity in loss of unconsolidated joint ventures	2,158	1,542	4,740	540
Gain on sale of real estate			(76,018)
Unrealized loss on interest rate cap	172	124	7	595
Stock-based compensation			3,379	779
Depreciation and amortization	49,551	50,571	84,218	109,234
Amortization of deferred financing costs			3,590	4,061
Amortization of above and below market leases, net			(414)	(594)
Straight-line rent adjustment			(2,832)	(3,479)
Change in operating assets and liabilities
Tenants and other receivables			(3,076)	265
Prepaid expenses, deferred expenses and other assets			(2,968)	461
Accounts payable, accrued expenses and other liabilities			(20)	(22,451)
Net cash provided by operating activities			16,205	21,700
CASH FLOW FROM INVESTING ACTIVITIES
Investment in unconsolidated joint ventures			(6,160)	(15,047)
Distributions from unconsolidated joint ventures			8,505	7,515
Net proceeds from sale of real estate			134,599
Development of real estate			(142,003)	(106,075)
Net cash used in investing activities			(5,059)	(113,607)
CASH FLOW FROM FINANCING ACTIVITIES
Repayment of mortgage loans payable			(131,414)
Proceeds from Future Funding Facility				79,998
Proceeds from Unsecured Term Loan				85,000
Payment of deferred financing costs			(363)	(2,449)
Offering related costs			(113)
Preferred dividends paid			(1,661)
Common dividends paid			(17,865)	(16,913)
Non-controlling interests distributions paid			(10,058)	(10,935)
Net cash (used in) provided by financing activities			(161,474)	134,701
Net increase (decrease) in cash, cash equivalents, and restricted cash			(150,328)	42,794
Cash, cash equivalents, and restricted cash, beginning of period			417,234	139,642
Cash, cash equivalents, and restricted cash, end of period	266,906	182,436	266,906	182,436
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash payments for interest			43,296	33,984
Capitalized interest			12,144	3,361
Income taxes paid			344	266
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Development of real estate financed with accounts payable			14,465	12,100
Dividends and distribution declared and unpaid			14,046	13,969
Decrease in real estate, net resulting from deconsolidated properties			(156,568)
Transfer to real estate assets held for sale			15,139
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents	100,448	9,873	100,448	9,873
Restricted cash	166,458	172,563	166,458	172,563
Cash, cash equivalents, and restricted cash, end of period	$ 266,906	$ 182,436	$ 266,906	$ 182,436