Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ (9,700)	$ 21,667
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization, including amortization of debt issuance costs	9,596	8,569
Straight-lining of rental income	1,445	1,070
Change in fair value of marketable securities (see Note 7)	5,170	0
Liability related to discontinued operations (see Note 8)	23,797	0
Changes in operating assets and liabilities:
Tenant and other receivables, net	(214)	507
Other assets	13,558	13,131
Amounts due to Vornado	(1,778)	(353)
Accounts payable and accrued expenses	(5,030)	(2,961)
Other liabilities	(39)	(7)
Net cash provided by operating activities	36,805	41,623
CASH FLOWS FROM INVESTING ACTIVITIES
Construction in progress and real estate additions	(628)	(1,628)
Principal repayment proceeds from Rego Park II loan participation	753	0
Net cash provided by (used in) investing activities	125	(1,628)
CASH FLOWS FROM FINANCING ACTIVITIES
Debt repayments	(971)	(901)
Dividends paid	(23,022)	(21,737)
Debt issuance costs	0	(9)
Net cash used in financing activities	(23,993)	(22,647)
Net increase in cash and cash equivalents and restricted cash	12,937	17,348
Cash and cash equivalents and restricted cash at beginning of period	393,279	374,678
Cash and cash equivalents and restricted cash at end of period	406,216	392,026
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents at beginning of period	307,536	288,926
Restricted cash at beginning of period	85,743	85,752
Cash and cash equivalents and restricted cash at beginning of period	393,279	374,678
Cash and cash equivalents at end of period	319,026	306,530
Restricted cash at end of period	87,190	85,496
Cash and cash equivalents and restricted cash at end of period	406,216	392,026
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash payments for interest	8,356	5,386
NON-CASH TRANSACTIONS
Liability for real estate additions, including $27 and $52 for development fees due to Vornado in 2018 and 2017, respectively	1,028	192
Write-off of fully amortized and/or depreciated assets	$ 11,223	$ 0