Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 43,780	$ 16,903
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, including amortization of debt issuance costs	17,503	17,792
Net gain on sale of real estate	(9,124)	0
Straight-lining of rental income	5,019	8,820
Write-off of tenant receivables	0	1,022
Stock-based compensation	450	600
Change in fair value of marketable securities	(4,280)	9,558
Dividends received in stock	0	(214)
Changes in operating assets and liabilities:
Tenant and other receivables	554	(2,646)
Other assets	(16,917)	1,687
Amounts due to Vornado	(276)	(692)
Accounts payable and accrued expenses	26,138	241
Other liabilities	(328)	(315)
Net cash provided by operating activities	62,519	52,756
CASH FLOWS FROM INVESTING ACTIVITIES
Construction in progress and real estate additions	(10,086)	(13,009)
Proceeds from sale of land	9,291	0
Return of short-term investment	3,600	0
Net cash provided by (used in) investing activities	2,805	(13,009)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid	(46,100)	(46,068)
Debt issuance costs	(45)	(99)
Proceeds from borrowing	0	145,708
Net cash (used in) provided by financing activities	(46,145)	99,541
Net increase in cash and cash equivalents and restricted cash	19,179	139,288
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	469,056	453,265
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	447,687	441,905
Restricted cash at end of period	21,369	11,360
Cash and cash equivalents and restricted cash at end of period	469,056	453,265
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash payments for interest	9,401	13,510
NON-CASH TRANSACTIONS
Liability for real estate additions, including $79 and $269 for development fees due to Vornado in 2021 and 2020, respectively	1,776	3,289
Write-off of fully depreciated assets	$ 5,628	$ 367