Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2014

Fair Value Measurements [Abstract]

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

		As of December 31, 2014
(Amounts in thousands)		Total		Level 1		Level 2		Level 3
	Marketable securities	$	44,646	$	44,646	$	-	$	-
	Short-term investments		24,998		24,998		-		-
	Interest rate cap (included in other assets)		11		-		11		-
	Total assets	$	69,655	$	69,644	$	11	$	-
		As of December 31, 2013
(Amounts in thousands)		Total		Level 1		Level 2		Level 3
	Marketable securities	$	31,522	$	31,522	$	-	$	-

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

			As of December 31, 2014				As of December 31, 2013
			Carrying		Fair		Carrying		Fair
(Amounts in thousands)			Amount		Value		Amount		Value
Assets:
	Cash equivalents	$	111,590	$	111,590	$	184,796	$	184,796
Liabilities:
	Mortgages payable	$	1,032,780	$	1,025,000	$	1,049,959	$	1,072,000
	Leasing commissions (included in Amounts due to Vornado)		-		-		42,924		43,000
		$	1,032,780	$	1,025,000	$	1,092,883	$	1,115,000