CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Flows from Operating Activities:
Net (loss) income	$ (2,458)	$ 12,174
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	117,833	125,714
Straight-lining of rental revenue	(19,731)	(22,110)
Amortization of stock-based compensation expense	9,638	12,685
Loss from unconsolidated joint ventures	10,176	1,483
Distributions of earnings from unconsolidated joint ventures	1,459	1,980
Amortization of deferred financing costs	4,637	5,626
Realized and unrealized losses (gains) on marketable securities	560	(2,474)
Amortization of above and below-market leases, net	(2,744)	(6,003)
Income from unconsolidated real estate funds	(141)	(65)
Distributions of earnings from unconsolidated real estate funds	353	1,137
Receipt of accrued interest on preferred equity investment		2,339
Other non-cash adjustments	152	(339)
Changes in operating assets and liabilities:
Accounts and other receivables	493	381
Deferred charges	(8,107)	(8,466)
Other assets	(4,367)	(6,294)
Accounts payable and accrued expenses	(4,148)	(12,293)
Other liabilities	(494)	1,338
Net cash provided by operating activities	103,111	106,813
Cash Flows from Investing Activities:
Additions to real estate	(46,575)	(50,766)
Repayment of amounts due from affiliates	36,918	11,000
Sales of marketable securities	19,049	10,407
Purchases of marketable securities	(9,248)	(8,867)
Contributions of capital to unconsolidated real estate funds	(2,936)	(243)
Distributions of capital from unconsolidated real estate funds		1,260
Due from affiliates		(181,000)
Investments in and contributions of capital to unconsolidated joint ventures		(52,525)
Redemption of preferred equity investment		33,750
Real estate acquisition deposits		(20,000)
Net cash used in investing activities	(2,792)	(256,984)
Cash Flows from Financing Activities:
Borrowings under revolving credit facility	163,082	170,000
Proceeds from the sale of a 10.0% interest in 1633 Broadway	111,984
Repurchases of common shares	(100,000)	(6,488)
Dividends paid to common stockholders	(44,989)	(46,804)
Distributions paid to common unitholders	(4,608)	(5,047)
Contributions from noncontrolling interests	11,555	14,966
Distributions to noncontrolling interests	(6,357)	(34,919)
Repayment of note payable issued in connection with the acquisition of noncontrolling interest in unconsolidated real estate fund	(8,771)
Proceeds from notes and mortgages payable	3,073
Net cash provided by financing activities	124,653	91,141
Repurchase of shares related to stock compensation agreements and related tax withholdings	(316)	(307)
Debt issuance costs		(260)
Net increase (decrease) in cash and cash equivalents and restricted cash	224,972	(59,030)
Cash and cash equivalents and restricted cash at beginning of period	331,487	365,409
Cash and cash equivalents and restricted cash at end of period	556,459	306,379
Reconciliation of Cash and Cash Equivalents and Restricted Cash:
Cash and cash equivalents at beginning of period	306,215	339,653
Restricted cash at beginning of period	25,272	25,756
Cash and cash equivalents and restricted cash at beginning of period	331,487	365,409
Cash and cash equivalents at end of period	522,502	283,485
Restricted cash at end of period	33,957	22,894
Cash and cash equivalents and restricted cash at end of period	556,459	306,379
Supplemental Disclosure of Cash Flow Information:
Cash payments for interest	68,920	69,401
Cash payments for income taxes, net of refunds	1,130	2,053
Non-Cash Transactions:
Common shares issued upon redemption of common units	85,311	23,990
Dividends and distributions declared but not yet paid	24,292	25,953
Additions to real estate included in accounts payable and accrued expenses	16,232	18,370
Write-off of fully amortized and/or depreciated assets	$ 8,612	3,387
Change in value of interest rate swaps		$ 24,371