Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
REVENUES
Property rentals	$ 34,171	$ 33,773
Expense reimbursements	14,604	13,528
Total revenues	48,775	47,301
EXPENSES
Operating, including fees to Vornado of $982 and $1,032, respectively	15,554	14,541
Depreciation and amortization	7,223	7,183
General and administrative, including management fees to Vornado of $595 and $540, respectively	1,073	1,106
Total expenses	23,850	22,830
OPERATING INCOME	24,925	24,471
Interest and other income, net	385	34
Interest and debt expense	(11,148)	(11,473)
Income from continuing operations	14,162	13,032
Income from discontinued operations	0	6,392
Net income	14,162	19,424
Net loss attributable to the noncontrolling interest	0	58
Net income attributable to Alexander's	$ 14,162	$ 19,482
Income per common share - basic and diluted:
Income from continuing operations (in dollars per share)	$ 2.77	$ 2.55
Income from discontinued operations, net (in dollars per share)	$ 0	$ 1.26
Net income per common share (in dollars per share)	$ 2.77	$ 3.81
Weighted average shares outstanding (in shares)	5,108,016	5,106,984
Dividends per common share	$ 2.75	$ 3.75