Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 23,507	$ 45,641
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, including amortization of debt issuance costs	25,554	27,401
Straight-lining of rental income	18,306	1,950
Write-off of tenant receivables	4,122	0
Stock-based compensation	600	394
Change in fair value of marketable securities	10,789	6,257
Dividends received in stock	(214)	0
Changes in operating assets and liabilities:
Tenant and other receivables	(4,886)	(1,549)
Other assets	(33,731)	7,957
Amounts due to Vornado	(697)	3,981
Accounts payable and accrued expenses	12,646	8,375
Other liabilities	(475)	(454)
Net cash provided by operating activities	55,521	99,953
CASH FLOWS FROM INVESTING ACTIVITIES
Construction in progress and real estate additions	(23,630)	(6,566)
Net cash used in investing activities	(23,630)	(6,566)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid	(69,118)	(69,090)
Debt issuance costs	(2,680)	(15)
Proceeds from borrowing	145,708	0
Debt repayments	(50,000)	0
Net cash provided by (used in) financing activities	23,910	(69,105)
Net increase in cash and cash equivalents and restricted cash	55,801	24,282
Cash and cash equivalents and restricted cash at beginning of period	313,977	289,495
Cash and cash equivalents and restricted cash at end of period	369,778	313,777
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents at beginning of period	298,063	283,056
Restricted cash at beginning of period	15,914	6,439
Cash and cash equivalents and restricted cash at beginning of period	313,977	289,495
Cash and cash equivalents at end of period	355,712	304,229
Restricted cash at end of period	14,066	9,548
Cash and cash equivalents and restricted cash at end of period	369,778	313,777
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash payments for interest	17,959	26,898
NON-CASH TRANSACTIONS
Liability for real estate additions, including $456 and $18 for development fees due to Vornado in 2020 and 2019, respectively	3,622	233
Write-off of fully depreciated assets	457	0
Lease liability arising from the recognition of right-of-use asset	0	5,428
Reclassification of prepaid real estate taxes to construction in progress for property in redevelopment	$ 0	$ 1,466