Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 64,822	$ 53,335
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, including amortization of debt issuance costs	27,666	24,725
Straight-lining of rental income	1,594	(1,276)
Stock-based compensation expense	450	600
Change in operating assets and liabilities:
Tenant and other receivables, net	1,081	(559)
Other assets	(23,088)	(13,969)
Amounts due to Vornado	(1,951)	(102)
Accounts payable and accrued expenses	11,346	9,527
Other liabilities	(22)	(23)
Net cash provided by operating activities	81,898	72,258
CASH FLOWS FROM INVESTING ACTIVITIES
Construction in progress and real estate additions	(13,441)	(41,919)
Change in restricted cash	275	(168)
Proceeds from maturing short-term investments	0	24,998
Net cash used in investing activities	(13,166)	(17,089)
CASH FLOWS FROM FINANCING ACTIVITIES
Debt repayments	(2,555)	(322,372)
Proceeds from borrowing	0	350,000
Dividends paid	(61,363)	(53,675)
Debt issuance costs	(16)	(4,071)
Net cash used in financing activities	(63,934)	(30,118)
Net increase in cash and cash equivalents	4,798	25,051
Cash and cash equivalents at beginning of period	259,349	227,815
Cash and cash equivalents at end of period	264,147	252,866
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash payments for interest, excluding capitalized interest of $1,420 in 2015	14,469	18,065
NON-CASH TRANSACTIONS
Liability for real estate additions, including $92 and $5,540 for development fees due to Vornado in 2016 and 2015, respectively	1,053	13,259
Write-off of fully amortized and/or depreciated assets	$ 1,691	$ 9,600