Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 55,181	$ 23,507
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, including amortization of debt issuance costs	26,923	25,554
Net gain on sale of real estate	(9,124)	0
Straight-lining of rental income	7,411	18,306
Write-off of tenant receivables	0	4,122
Stock-based compensation	450	600
Change in fair value of marketable securities	(3,411)	10,789
Dividends received in stock	0	(214)
Changes in operating assets and liabilities:
Tenant and other receivables	1,497	(4,886)
Other assets	(9,146)	(33,731)
Amounts due to Vornado	1,032	(697)
Accounts payable and accrued expenses	20,601	12,646
Other liabilities	(495)	(475)
Net cash provided by operating activities	90,919	55,521
CASH FLOWS FROM INVESTING ACTIVITIES
Construction in progress and real estate additions	(14,711)	(23,630)
Proceeds from sale of land	9,291	0
Return of short-term investment	3,600	0
Net cash used in investing activities	(1,820)	(23,630)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid	(69,160)	(69,118)
Debt issuance costs	(45)	(2,680)
Proceeds from borrowing	0	145,708
Debt repayments	0	(50,000)
Net cash (used in) provided by financing activities	(69,205)	23,910
Net increase in cash and cash equivalents and restricted cash	19,894	55,801
Cash and cash equivalents and restricted cash at beginning of period	449,877	313,977
Cash and cash equivalents and restricted cash at end of period	469,771	369,778
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents at beginning of period	428,710	298,063
Restricted cash at beginning of period	21,167	15,914
Cash and cash equivalents and restricted cash at beginning of period	449,877	313,977
Cash and cash equivalents at end of period	448,913	355,712
Restricted cash at end of period	20,858	14,066
Cash and cash equivalents and restricted cash at end of period	469,771	369,778
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash payments for interest	14,182	17,959
NON-CASH TRANSACTIONS
Liability for real estate additions, including $109 and $456 for development fees due to Vornado in 2021 and 2020, respectively	1,832	3,622
Write-off of fully depreciated assets	$ 5,628	$ 457