Consolidated and Combined Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
OPERATING ACTIVITIES:
Net income (loss)	$ 46,613,000	$ (79,084,000)	$ 61,974,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Share-based compensation expense	52,675,000	33,693,000	4,502,000
Depreciation and amortization, including amortization of debt issuance costs	215,659,000	164,580,000	135,072,000
Deferred rent	(14,056,000)	(10,388,000)	(15,551,000)
(Income) loss from unconsolidated real estate ventures, net	(39,409,000)	4,143,000	947,000
Amortization of above- and below-market lease intangibles, net	(220,000)	(862,000)	(1,353,000)
Amortization of lease incentives	3,406,000	4,023,000	3,592,000
Return on capital from unconsolidated real estate ventures	7,827,000	2,563,000	1,520,000
Reduction of gain (gain) on bargain purchase	7,606,000	(24,376,000)	0
Non-Cash Gain (Loss) on Extinguishment of Debt	(4,536,000)
Loss on extinguishment of debt	5,153,000	701,000	0
Gain on sale of real estate	(52,183,000)	0	0
Unrealized gain on interest rate swaps and caps	(926,000)	(1,348,000)	0
Bad debt expense	3,298,000	3,807,000	750,600
Other non-cash items	1,388,000	3,955,000	6,236,000
Deferred Income Taxes and Tax Credits	(718,000)	(10,408,000)	0
Changes in operating assets and liabilities:
Tenant and other receivables	(5,582,000)	(2,098,000)	(3,693,000)
Other assets, net	(16,600,000)	(23,481,000)	(16,614,000)
Accounts payable and accrued expenses	(5,984,000)	16,160,000	7,667,000
Other liabilities, net	(19,137,000)	(7,397,000)	(25,509,000)
Net cash provided by operating activities	188,193,000	74,183,000	159,541,000
INVESTING ACTIVITIES:
Development costs, construction in progress and real estate additions	(385,943,000)	(210,593,000)	(237,814,000)
Payments to Acquire Real Estate	(23,246,000)	0	0
Cash and restricted cash received in connection with the Combination, net		97,416,000
Proceeds from Sale of Real Estate	413,077,000	0	0
Acquisition of interests in unconsolidated real estate ventures, net of cash acquired	(386,000)	(8,834,000)	0
Distributions of capital from unconsolidated real estate ventures	14,408,000	6,929,000	0
Distribution of capital from sale of interest in an unconsolidated real estate venture	80,279,000	0	0
Investments in and advances to unconsolidated real estate ventures	(31,197,000)	(16,321,000)	(23,027,000)
Proceeds from Collection of Notes Receivable	0	50,934,000	0
Other investments	(665,000)	(2,207,000)	(1,966,000)
Proceeds from repayment of receivable from former parent	0	75,000,000	4,000,000
Net cash provided by investing activities	66,327,000	(7,676,000)	(258,807,000)
FINANCING ACTIVITIES:
Contributions from former parent, net	0	160,203,000
Payments of Distributions to Affiliates			(3,763,000)
Acquisition of interest in consolidated real estate venture	(5,550,000)	0	0
Repayment of borrowings from former parent	0	(115,630,000)	0
Proceeds from borrowings from former parent	0	4,000,000	79,500,000
Capital lease payments	(114,000)	(17,827,000)	0
Borrowings under mortgages payable	118,141,000	366,239,000	0
Borrowings under revolving credit facility	35,000,000	115,751,000	0
Borrowings under unsecured term loans	250,000,000	50,000,000	0
Repayments of mortgages payable	(312,894,000)	(272,905,000)	(24,364,000)
Repayments of revolving credit facility	(150,751,000)	0	0
Debt issuance costs	(3,114,000)	(19,287,000)	(70,000)
Proceeds from common stock issued pursuant to Employee Share Purchase Plan	597,000	0	0
Dividends paid to common shareholders	(107,372,000)	(26,540,000)	0
Distributions to redeemable noncontrolling interests	(17,398,000)	(4,556,000)	0
Contributions from noncontrolling interests	250,000	357,000	0
Distributions to noncontrolling interests	(340,000)	(18,000)	(220,000)
Net cash (used in) provided by financing activities	(193,545,000)	239,787,000	51,083,000
Net increase in cash and cash equivalents and restricted cash	60,975,000	306,294,000	(48,183,000)
Cash and cash equivalents and restricted cash as of the beginning of the period	338,557,000	32,263,000	80,446,000
Cash and cash equivalents and restricted cash as of the end of the period	399,532,000	338,557,000	32,263,000
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AS OF END OF THE PERIOD:
Cash and cash equivalents and restricted cash	338,557,000	32,263,000	80,446,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW AND NON-CASH INFORMATION:
Transfer Mortgage Payable	0	115,630,000	115,022,000
Cash paid for interest (net of capitalized interest of $14,863 and $2,285 in 2018 and 2017)	64,605,000	52,388,000	45,373,000
Accrued capital expenditures included in accounts payable and accrued expenses	53,073,000	12,445,000	8,851,000
Write-off of fully depreciated assets	52,272,000	55,998,000	100,076,000
Cash receipts from (payments for) income taxes	(1,965,000)	(3,396,000)	(1,165,000)
Noncash Contribution From Redeemable Noncontrolling Interests	0	5,420,000	0
Temporary Equity, Redemptions of OP Units	(109,208,000)	0	0
Issuance of common limited partnership units at the Separation	0	96,632,000	0
Issuance of common shares at the Separation	0	2,330,579,000	0
Issuance of common shares in connection with the Combination	0	864,918,000	0
Issuance of common limited partnership units in connection with the Combination	0	359,967,000	0
Contribution from former parent in connection with the Separation	$ 0	$ 172,817,000	$ 0