Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value [Abstract]

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

		As of September 30, 2013
(Amounts in thousands)		Total		Level 1		Level 2		Level 3
	Marketable securities	$	30,210	$	30,210	$	-	$	-
		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 September 30, 2013				As of December 31, 2012
		Carrying		Fair		Carrying		Fair
(Amounts in thousands)		Amount		Value		Amount		Value
Assets:
	Cash equivalents	$	298,489	$	298,489	$	289,054	$	289,054
Liabilities:
	Mortgages payable	$	1,054,046	$	1,082,000	$	1,065,916	$	1,097,000
	Leasing commissions (included in Amounts due to Vornado)		43,708		44,000		45,803		46,000
		$	1,097,754	$	1,126,000	$	1,111,719	$	1,143,000