CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash Flows from Operating Activities:
Net (loss) income	$ (6,581)	$ 23,174
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	176,722	188,772
Straight-lining of rental revenue	(24,170)	(33,407)
Loss from unconsolidated joint ventures	14,444	2,815
Amortization of stock-based compensation expense	14,141	17,859
Amortization of deferred financing costs	6,957	8,450
Amortization of above and below-market leases, net	(4,653)	(8,555)
Distributions of earnings from unconsolidated joint ventures	1,688	2,852
Distributions of earnings from unconsolidated real estate funds	480	1,288
Income from unconsolidated real estate funds	(85)	(271)
Realized and unrealized gains on marketable securities	(129)	(2,395)
Receipt of accrued interest on preferred equity investment		2,339
Gain on sale of real estate		(1,140)
Other non-cash adjustments	231	(153)
Changes in operating assets and liabilities:
Accounts and other receivables	3,942	(324)
Deferred charges	(10,116)	(16,620)
Other assets	(36,068)	25,963
Accounts payable and accrued expenses	2,827	(5,457)
Other liabilities	(61)	1,457
Net cash provided by operating activities	139,569	206,647
Cash Flows from Investing Activities:
Additions to real estate	(60,348)	(70,094)
Repayment of amounts due from affiliates	36,918	181,000
Sales of marketable securities	19,049	15,738
Purchases of marketable securities	(12,207)	(11,945)
Contributions of capital to unconsolidated real estate funds	(2,945)	(3,860)
Due from affiliates		(181,000)
Proceeds from sale of real estate		150,307
Investments in and contributions of capital to unconsolidated joint ventures		(148,896)
Redemption of preferred equity investment		33,750
Real estate acquisition deposits		(25,000)
Distributions of capital from unconsolidated real estate funds		1,613
Net cash used in investing activities	(19,533)	(58,387)
Cash Flows from Financing Activities:
Borrowings under revolving credit facility	163,082	195,000
Proceeds from the sale of a 10.0% interest in 1633 Broadway	111,984
Repurchases of common shares	(108,520)	(89,005)
Dividends paid to common stockholders	(67,165)	(70,243)
Distributions paid to common unitholders	(6,724)	(7,561)
Contributions from noncontrolling interests	11,555	14,989
Distributions to noncontrolling interests	(9,530)	(40,037)
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	9,791	3,200
Repurchase of shares related to stock compensation agreements and related tax withholdings	(318)	(314)
Repayment of borrowings under revolving credit facility		(195,000)
Acquisition of noncontrolling interest in consolidated real estate fund		(1,000)
Debt issuance costs		(260)
Net cash provided by (used in) financing activities	95,384	(190,231)
Net increase (decrease) in cash and cash equivalents and restricted cash	215,420	(41,971)
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	546,907	323,438
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	515,942	298,066
Restricted cash at end of period	30,965	25,372
Cash and cash equivalents and restricted cash at end of period	546,907	323,438
Supplemental Disclosure of Cash Flow Information:
Cash payments for interest	102,379	104,616
Cash payments for income taxes, net of refunds	1,440	2,049
Non-Cash Transactions:
Common shares issued upon redemption of common units	85,710	24,006
Dividends and distributions declared but not yet paid	24,173	25,307
Additions to real estate included in accounts payable and accrued expenses	14,644	13,342
Write-off of fully amortized and/or depreciated assets	$ 8,677	5,292
Change in value of interest rate swaps		28,502
Note payable issued in connection with the acquisition of noncontrolling interest in unconsolidated real estate fund		$ 8,771