Summary of Significant accounting policies (Tables)

12 Months Ended

Dec. 31, 2014

Summary of Significant Accounting Policies [Abstract]

Reconciliation Of Net Income Attributable To Common Stockholders To Estimated Taxable Income [Table Text Block]

(Unaudited and in thousands)		Year Ended December 31,
		2014		2013		2012
Net income attributable to Alexander’s		$	67,925	$	56,915	$	674,387
Straight-line rent adjustments			(2,538)		(3,707)		(4,475)
Depreciation and amortization timing differences			2,283		2,134		910
Interest expense			10		27		29
Reversal of liability for income taxes			(420)		(206)		-
Additional tax gain on sale of the Kings Plaza
	Regional Shopping Center		(357)		-		23,928
Other			1,112		(2,213)		4,396
Estimated taxable income		$	68,015	$	52,950	$	699,175