Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 21,667	$ 22,019
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, including amortization of debt issuance costs	8,569	8,974
Straight-lining of rental income	1,070	(44)
Changes in operating assets and liabilities:
Tenant and other receivables, net	507	705
Other assets	13,131	5,548
Amounts due to Vornado	(353)	(2,318)
Accounts payable and accrued expenses	(2,961)	10,499
Other liabilities	(7)	(7)
Net cash provided by operating activities	41,623	45,376
CASH FLOWS FROM INVESTING ACTIVITIES
Construction in progress and real estate additions	(1,628)	(8,853)
Net cash used in investing activities	(1,628)	(8,853)
CASH FLOWS FROM FINANCING ACTIVITIES
Debt repayments	(901)	(836)
Dividends paid	(21,737)	(20,452)
Debt issuance costs	(9)	(16)
Net cash used in financing activities	(22,647)	(21,304)
Net increase in cash and cash equivalents and restricted cash	17,348	15,219
Cash and cash equivalents and restricted cash at beginning of period	374,678	344,656
Cash and cash equivalents and restricted cash at end of period	392,026	359,875
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents at beginning of year	288,926	259,349
Restricted cash at beginning of period	85,752	85,307
Cash and cash equivalents and restricted cash at beginning of period	374,678	344,656
Cash and cash equivalents at end of year	306,530	276,234
Restricted cash at end of period	85,496	83,641
Cash and cash equivalents and restricted cash at end of period	392,026	359,875
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash payments for interest	5,386	4,676
NON-CASH TRANSACTIONS
Liability for real estate additions, including $52 and $36 for development fees due to Vornado in 2017 and 2016, respectively	192	1,931
Write-off of fully amortized and/or depreciated assets	0	12
Change in unrealized net gain on available-for-sale securities	$ (3,447)	$ (777)