Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 14,162	$ 19,424
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, including amortization of debt issuance costs	7,821	9,505
Straight-lining of rental income	(949)	(1,469)
Change in operating assets and liabilities:
Tenant and other receivables, net	(424)	(677)
Other assets	9,277	10,481
Amounts due to Vornado	(822)	(655)
Accounts payable and accrued expenses	4,488	7,009
Other liabilities	(1)	0
Net cash provided by operating activities	33,552	43,618
CASH FLOWS FROM INVESTING ACTIVITIES
Construction in progress and real estate additions	(1,267)	(2,709)
Restricted cash	919	968
Proceeds from maturing short-term investments	0	5,000
Net cash (used in) provided by investing activities	(348)	3,259
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid	(14,047)	(19,151)
Debt repayments	(3,963)	(3,698)
Debt issuance costs	(82)	(395)
Net cash used in financing activities	(18,092)	(23,244)
Net increase in cash and cash equivalents	15,112	23,633
Cash and cash equivalents at beginning of period	353,396	506,619
Cash and cash equivalents at end of period	368,508	530,252
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash payments for interest	10,472	12,258
NON-CASH TRANSACTIONS
Change in unrealized net gain on securities available-for-sale	3,254	0
Non-cash additions to real estate included in accounts payable and accrued expenses	603	1,806
Write-off of fully amortized and depreciated assets	$ 0	$ 624