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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 67,925 us-gaap_ProfitLoss | $ 56,915 us-gaap_ProfitLoss | $ 674,993 us-gaap_ProfitLoss
Other comprehensive income: |  |  |
Change in unrealized net gain on available-for-sale securities | 13,124 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent | 316 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent | 1,206 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Change in value of interest rate cap | (189)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent |  |
Comprehensive income | 80,860 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | 57,231 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | 676,199 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Less comprehensive income attributable to the noncontrolling interest | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | (606)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income attributable to Alexander's | $ 80,860 us-gaap_ComprehensiveIncomeNetOfTax | $ 57,231 us-gaap_ComprehensiveIncomeNetOfTax | $ 675,593 us-gaap_ComprehensiveIncomeNetOfTax

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