Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 22,019	$ 17,822
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, including amortization of debt issuance costs	8,974	8,044
Straight-lining of rental income	(44)	(551)
Change in operating assets and liabilities:
Tenant and other receivables, net	705	(1,212)
Other assets	5,548	11,165
Amounts due to Vornado	(2,318)	(29)
Accounts payable and accrued expenses	10,499	9,861
Other liabilities	(7)	(7)
Net cash provided by operating activities	45,376	45,093
CASH FLOWS FROM INVESTING ACTIVITIES
Construction in progress and real estate additions	(8,853)	(14,908)
Change in restricted cash	1,666	(13)
Net cash used in investing activities	(7,187)	(14,921)
CASH FLOWS FROM FINANCING ACTIVITIES
Debt repayments	(836)	(776)
Dividends paid	(20,452)	(17,890)
Debt issuance costs	(16)	(9)
Net cash used in financing activities	(21,304)	(18,675)
Net increase in cash and cash equivalents	16,885	11,497
Cash and cash equivalents at beginning of period	259,349	227,815
Cash and cash equivalents at end of period	276,234	239,312
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash payments for interest, excluding capitalized interest of $459 in 2015	4,676	6,220
NON-CASH TRANSACTIONS
Liability for real estate additions, including $36 and $4,159 for development fees due to Vornado	1,931	13,717
Write-off of fully amortized and/or depreciated assets	$ 12	$ 83