CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 139,811	$ 423
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	131,628	142,099
Amortization of deferred financing costs	5,548	2,663
Gain on sale of real estate	(133,989)
Straight-lining of rental income	(32,121)	(44,542)
Amortization of above and below-market leases, net	(10,989)	(3,481)
Debt breakage costs	7,877
Unrealized gain on interest rate swaps	(1,802)	(16,933)
Realized and unrealized (gains) losses on marketable securities	(2,486)	312
Income from unconsolidated joint ventures	(18,472)	(3,499)
Distributions of earnings from unconsolidated joint ventures	2,758	4,864
Loss from unconsolidated real estate funds	2,123	1,286
Distributions of earnings from unconsolidated real estate funds	146	200
Amortization of stock-based compensation expense	7,867	6,183
Other non-cash adjustments	(26)	957
Changes in operating assets and liabilities:
Accounts and other receivables	3,102	(165)
Deferred charges	(14,297)	(7,165)
Other assets	7,294	(4,942)
Accounts payable and accrued expenses	(15,257)	54,937
Deferred income taxes	(143)	(2,287)
Other liabilities	3,420	1,066
Net cash provided by operating activities	81,992	131,976
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sale of real estate	540,333
Additions to real estate	(33,079)	(73,840)
Investments in unconsolidated joint ventures	(28,791)
Distributions of capital from unconsolidated joint ventures	20,000
Deposit on real estate	(12,914)
Changes in restricted cash	(12,697)	12,512
Distributions of capital from unconsolidated real estate funds	3,845
Contributions of capital to unconsolidated real estate funds	(584)
Net cash provided by (used in) investing activities	476,113	(61,328)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of notes and mortgages payable	(1,044,821)	(414,202)
Proceeds from notes and mortgages payable	991,556	506,627
Repayment of borrowings under revolving credit facility	(290,000)	(60,000)
Borrowings under revolving credit facility	60,000	60,000
Distributions to noncontrolling interests	(107,162)	(1,740)
Dividends paid to common stockholders	(43,832)	(40,390)
Settlement of interest rate swap liabilities	(19,425)	(16,040)
Contributions from noncontrolling interests	9,278
Debt breakage costs	(7,877)
Debt issuance costs	(7,344)	(6,487)
Distributions paid to common unitholders	(6,526)	(9,824)
Repurchase of shares related to stock compensation agreements and related tax withholdings	(154)
Net cash (used in) provided by financing activities	(466,307)	17,944
Net increase in cash and cash equivalents	91,798	88,592
Cash and cash equivalents at beginning of period	162,965	143,884
Decrease in cash due to deconsolidation of real estate fund investments		(7,987)
Cash and cash equivalents at end of period	254,763	224,489
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash payments for interest	73,817	68,957
Cash payments for income taxes, net of refunds	3,191	1,319
NON-CASH TRANSACTIONS:
Common shares issued upon redemption of common units	135,959	124,079
Dividends and distributions declared but not yet paid	25,211	25,151
Write-off of fully amortized and/or depreciated assets	4,930	5,379
Additions to real estate included in accounts payable and accrued expenses	8,988	10,678
(Sales) purchases of marketable securities resulting in an (increase) decrease to restricted cash	(3,313)	268
Change in fair value of interest rate swaps	9	41,614
(Decrease) increase due to deconsolidation of 75 Howard:
Investments in unconsolidated joint ventures	14,915
Real estate, net	$ (14,915)
(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)