CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
CASH FLOW FROM OPERATING ACTIVITIES
Net loss	$ (38,803)	$ (120,813)	$ (91,009)
Adjustments to reconcile net loss to net cash provided by operating activities:
Equity in loss (income) of unconsolidated joint ventures	(4,772)	7,788	(4,646)
Distributions from unconsolidated joint ventures	6,733	14,344	15,677
Gain on sale of interest in unconsolidated joint venture		(60,302)
Gain on sale of real estate		(11,447)
Unrealized loss on interest rate cap	2,933	701	1,378
Stock-based compensation	944	7,018	1,068
Depreciation and amortization	65,907	262,171	177,119
Amortization of deferred financing costs	2,657	8,719	5,361
Amortization of above and below market leases, net	(388)	(720)	(680)
Straight-line rent adjustment	(8,299)	(3,719)	(12,862)
Change in operating assets and liabilities
Tenants and other receivables	(1,473)	(4,753)	350
Prepaid expenses, deferred expenses and other assets	(25,596)	(7,877)	6,080
Accounts payable, accrued expenses and other liabilities	21,589	(21,462)	12,143
Net cash provided by operating activities	21,432	69,648	109,979
CASH FLOW FROM INVESTING ACTIVITIES
Acquisition of real estate and unconsolidated joint ventures	(2,630,412)
Investment in unconsolidated joint ventures		(37,993)	(9,000)
Net proceeds from sale of real estate		50,875
Net proceeds from disposition of interest in unconsolidated joint venture		257,373
Development of real estate	(11,273)	(243,105)	(66,193)
Net cash provided by (used in) investing activities	(2,641,685)	27,150	(75,193)
CASH FLOW FROM FINANCING ACTIVITIES
Proceeds from issuance of mortgage loans payable	1,161,196
Repayment of mortgage loans payable		(50,634)
Proceeds from Future Funding Facility		79,998	20,002
Proceeds from Unsecured Term Loan		230,000
Repayment of Unsecured Delayed Draw Term Loan		(85,000)
Payment of deferred financing costs	(21,431)	(4,348)	(914)
Proceeds from issuance of common stock and non-controlling interest	1,644,042
Proceeds from issuance of preferred stock		70,000
Offering related costs	(8,212)	(3,526)
Common dividends paid		(34,248)	(39,354)
Non-controlling interests distributions paid		(21,448)	(30,220)
Net cash provided by (used in) financing activities	2,775,595	180,794	(50,486)
Net increase (decrease) in cash, cash equivalents, and restricted cash	155,342	277,592	(15,700)
Cash, cash equivalents, and restricted cash, beginning of period		139,642	155,342
Cash, cash equivalents, and restricted cash, end of period	155,342	417,234	139,642
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash payments for interest	25,325	73,870	61,051
Capitalized interest	226	13,142	3,077
Income taxes paid	944	271	505
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Development of real estate financed with accounts payable	2,856	21,449	6,369
Dividends and distribution declared and unpaid	$ 27,894	13,968	$ 13,954
Decrease in assets and liabilities resulting from deconsolidated properties
Real estate, net		(67,616)
Tenant and other receivables, net		(814)
Lease intangible assets, net		(13,480)
Prepaid expenses, deferred expenses and other assets, net		(8)
Accounts payable, accrued expenses and other liabilities		$ 3,612