COMBINED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2014	Nov. 23, 2014	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 72,722		$ 2,069	$ 21,143
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	34,481		269,450	294,624
Unrealized (gain) loss on interest rate swaps	(15,084)		(39,814)	(75,760)
Straight-lining of rental income	(5,653)		(82,568)	(69,522)
Realized and unrealized (gains) losses on real estate fund investments	1,357			(21,201)
Loss from unconsolidated real estate funds			498
Distributions of cumulative earnings from unconsolidated real estate funds			189
Amortization of above and below-market leases, net	(467)		(9,536)	(9,917)
Amortization of stock-based compensation expense			11,278	7,309
Income from unconsolidated joint ventures	(938)		(7,413)	(6,850)
Other non-cash adjustments	1,368		2,628	5,824
Distributions of cumulative earnings from unconsolidated joint ventures	532		8,081	4,966
Amortization of deferred financing costs	240		6,804	2,565
Realized and unrealized (gains) losses on marketable securities	356		(494)	119
Defeasance cost in connection with the repayments of notes and mortgages payable	14,990		4,608
Gain on consolidation of an unconsolidated joint venture	(239,716)
Stock-based compensation expense in connection with the Founders Grant	71,000
Changes in operating assets and liabilities:
Restricted cash	6,502
Real estate fund investments	(51,362)			(127,743)
Accounts and other receivables	(150)		(4,521)	(3,152)
Deferred charges	(13,181)		(15,701)	(40,510)
Other assets	13,722		(12,037)	6,465
Accounts payable and accrued expenses	14,162		11,479	(6,152)
Deferred income taxes			(1,662)	(328)
Other liabilities	14,547		1,702	1,151
Net cash provided by (used in) operating activities	(80,572)		145,040	(16,969)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions of rental property			(517,823)
Additions to rental properties	(6,143)		(132,686)	(107,859)
Changes in restricted cash	18,556		15,080	12,424
Contributions to unconsolidated real estate funds			(1,780)
Distributions of capital from unconsolidated real estate funds			203
Distributions of capital from unconsolidated joint ventures			40	19
Cash received from properties in connection with the Formation Transactions	192,500
Net cash (used in) provided by investing activities	204,913		(636,966)	(95,416)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from notes and mortgages payable			1,362,414	1,013,544
Repayments of notes and mortgages payable	(1,704,330)		(689,269)	(927,633)
Proceeds from revolving credit facility			340,000	20,000
Purchase of marketable securities in connection with the defeasance of notes and mortgages payable	(435,774)		(214,608)
Repayments of revolving credit facility			(130,000)
Dividends paid to common stockholders			(82,105)	(68,723)
Debt issuance costs	(8,599)		(29,387)	(18,871)
Contributions from noncontrolling interests	57,843		7,651	167,929
Distributions to noncontrolling interests	(8,488)		(3,636)	(56,636)
Acquisition of noncontrolling interest in consolidated joint ventures				(261,464)
Cash paid for equity interests in the Formation Transactions	(214,949)
Proceeds from the issuance of common stock	2,590,599
Settlement of interest rate swap liabilities	(14,130)		(23,654)	(33,741)
Distributions paid to common unitholders			(18,412)	(16,735)
Net cash provided by (used in) financing activities	262,172		518,994	(182,330)
Net increase (decrease) in cash and cash equivalents	386,513		27,068	(294,715)
Cash and cash equivalents at beginning of period	52,086		143,884	438,599
Decrease in cash due to deconsolidation of real estate fund investments			(7,987)
Cash and cash equivalents at end of period	438,599	$ 52,086	162,965	143,884
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash payments for interest	23,728		140,111	159,186
Cash payments for income taxes, net of refunds			2,095	2,798
(Decrease) increase due to deconsolidation of real estate fund investments
Real estate fund investments			(416,438)
Loans payable to noncontrolling interests			(45,662)
Investments in unconsolidated real estate funds			27,292
Noncontrolling interests in consolidated real estate funds			(351,035)
Dividends and distributions declared but not yet paid			25,151	25,067
Common shares issued upon redemption of commons units			312,257
Transfer of rental property to assets held for sale			(346,685)
Marketable securities transferred in connection with the defeasance of notes and mortgages payable	435,774		214,608
Defeasance of notes and mortgages payable	(420,784)		(210,000)
Additions to real estate included in accounts payable and accrued expenses	16,598		12,104	32,009
Change in value of interest rate swaps			(8,161)	9,241
(Purchases) sale of marketable securities using restricted cash	146		(369)	(1,481)
Write-off of fully amortized and/or depreciated assets			$ 11,431	$ 1,399
Increase (decrease) in assets, liabilities and noncontrolling interests from the Formation Transactions:
Rental property, net	7,043,651
Real estate funds	(2,045,922)
Investment in unconsolidated joint ventures	(18,264)
Working capital, net of cash	26,784
Intangible assets	689,894
Notes and mortgages payable	4,261,903
Intangible liabilities	222,985
Preferred equity obligation	114,147
Profit sharing compensation payable	(57,296)
Interest rate swap liabilities	223,411
Reduction of equity for deferred offering costs	31,284
Predecessor [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income		109,398
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization		10,203
Unrealized (gain) loss on interest rate swaps		673
Straight-lining of rental income		161
Realized and unrealized (gains) losses on real estate fund investments		(129,354)
Income from unconsolidated joint ventures		(4,241)
Other non-cash adjustments		7,303
Distributions of cumulative earnings from unconsolidated joint ventures		2,874
Amortization of deferred financing costs		389
Realized and unrealized (gains) losses on marketable securities		(1,706)
Changes in operating assets and liabilities:
Restricted cash		(8,271)
Real estate fund investments		(31,061)
Accounts and other receivables		(35,989)
Deferred charges		600
Other assets		311
Accounts payable and accrued expenses		(4,605)
Profit sharing payables		156
Deferred income taxes		(2,205)
Other liabilities		869
Net cash provided by (used in) operating activities		(84,495)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions of rental property		(64,650)
Additions to rental properties		(1,266)
Changes in restricted cash		584
Distributions of capital from unconsolidated joint ventures		2,079
Proceeds from repayment of loan to management		3,000
Investment in unconsolidated joint ventures		(4,077)
Net cash (used in) provided by investing activities		(64,330)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of notes and mortgages payable		(2,827)
Contributions from noncontrolling interests		272,721
Distributions to noncontrolling interests		(266,028)
Contribution from Predecessor shareholders		23,688
Distributions to Predecessor shareholders		(149,135)
Proceeds from loans payable to noncontrolling interests		39,075
Offering costs		(23,744)
Net cash provided by (used in) financing activities		(106,250)
Net increase (decrease) in cash and cash equivalents		(255,075)
Cash and cash equivalents at beginning of period	$ 52,086	307,161
Cash and cash equivalents at end of period		52,086
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash payments for interest		19,829
Cash payments for income taxes, net of refunds		18,998
(Decrease) increase due to deconsolidation of real estate fund investments
(Purchases) sale of marketable securities using restricted cash		7,110
Write-off of fully amortized and/or depreciated assets		2,735
Increase (decrease) in assets, liabilities and noncontrolling interests from the Formation Transactions:
Debt assumed from affiliate		$ 27,299