Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value [Abstract]

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

		As of June 30, 2013
(Amounts in thousands)		Total		Level 1		Level 2		Level 3
	Marketable securities	$	32,635	$	32,635	$	-	$	-
		As of December 31, 2012
(Amounts in thousands)		Total		Level 1		Level 2		Level 3
	Marketable securities	$	31,206	$	31,206	$	-	$	-

Fair Value, by Balance Sheet Grouping [Table Text Block]

			As of June 30, 2013				As of December 31, 2012
			Carrying		Fair		Carrying		Fair
(Amounts in thousands)			Amount		Value		Amount		Value
Assets:
	Cash equivalents	$	318,682	$	318,682	$	289,054	$	289,054
Liabilities:
	Mortgages payable	$	1,058,028	$	1,101,000	$	1,065,916	$	1,097,000
	Leasing commissions (included in Amounts due to Vornado)		44,481		44,000		45,803		46,000
		$	1,102,509	$	1,145,000	$	1,111,719	$	1,143,000