Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 81,046	$ 67,445	$ 132,941
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization (including amortization of debt issuance costs)	37,086	34,849	30,445
Straight-lining of rental income	(12,609)	(15,182)	(23,381)
Reversal of income tax liability	(2,561)	(5,113)	(42,472)
Liability for stock appreciation rights	0	0	(34,275)
Stock-based compensation expense	300	0	0
Other non-cash adjustments	0	1,238	1,884
Changes in operating assets and liabilities:
Accounts receivable, net	1,672	(2,065)	4,421
Other assets	(5,484)	(6,068)	(12,421)
Payment for stock appreciation rights	0	0	(22,838)
Accounts payable and accrued expenses	(4,547)	13,273	4,668
Income tax liability of taxable REIT subsidiary	87	704	2,054
Amounts due to Vornado	(2,445)	(12,881)	(1,344)
Other liabilities	(31)	(178)	(103)
Net cash provided by operating activities	92,514	76,022	39,579
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from maturing short-term investments	23,000	40,000	15,000
Construction in progress and real estate additions	(14,415)	(42,310)	(74,855)
Purchases of short-term investments	(5,000)	(23,000)	(55,000)
Restricted cash	(3,202)	5,917	(86,427)
Net cash provided by (used in) investing activities	383	(19,393)	(201,282)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from borrowings	593,000	34,828	162,961
Debt repayments	(508,479)	(68,619)	(105,252)
Dividends paid	(61,277)	(38,295)	0
Debt issuance costs	(6,142)	(57)	(146)
Distributions to the noncontrolling interest	(600)	0	0
Excercise of stock options	0	0	934
Net cash provided by (used in) financing activities	16,502	(72,143)	58,497
Net increase (decrease) in cash and cash equivalents	109,399	(15,514)	(103,206)
Cash and cash equivalents at beginning of year	397,220	412,734	515,940
Cash and cash equivalents at end of year	506,619	397,220	412,734
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash payments for interest (of which $1,269 and $3,452 were capitalized in 2010 and 2009, respectively)	53,343	52,889	57,906
Non-cash additions to real estate included in accounts payable and accrued expenses	3,052	0	22,409
Write-off of fully amortized and/or depreciated assets	$ 6,799	$ 0	$ 0