2.4.0.82406403 - Disclosure - Secured and unsecured senior debt Schedule of secured and unsecured senior debts (Details)truefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalseD2013Q2YTDhttp://www.sec.gov/CIK0001035443duration2013-01-01T00:00:002013-06-30T00:00:00numberStandardhttp://www.xbrl.org/2003/instancepurexbrli0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$1true 3us-gaap_DebtInstrumentLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Debt Instrument [Line Items]2false 4us-gaap_LongtermDebtPercentageBearingFixedInterestAmountus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse26400180002640018USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.No definition available.false2Fixed Rate/Hedged Variable Rate3false 4us-gaap_LongtermDebtPercentageBearingVariableInterestAmountus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse319406000319406USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.No definition available.false2Unhedged Variable rate4false 4us-gaap_LongTermDebtus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse29594240002959424USD$falsefalsefalsexbrli:monetaryItemTypemonetaryCarrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 false2Principal amount5false 4are_DebtInstrumentPercentageOfOutstandingBalanceare_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse1.0001.000falsefalsefalsenum:percentItemTypepureRepresents the outstanding balance of debt as a percentage of aggregate debt outstanding.No definition available.false0Percentage of Total6false 4us-gaap_DebtWeightedAverageInterestRateus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.04090.0409[1]falsefalsefalsenum:percentItemTypepureReflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.No definition available.false0Weighted average interest rate (as a percent)7false 4are_DebtInstrumentWeightedAverageRemainingPeriodare_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse005 years 3 months 10 daysfalsefalsefalsexbrli:durationItemTypenaRepresents the weighted average remaining term of the debt instrument in years.No definition available.false0Weighted Average Remaining Terms (in years)8false 4are_FixedInterestRateDebtAsPercentageOfTotalOutstandingBalanceare_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.890.89falsefalsefalsenum:percentItemTypepureRepresents the outstanding balance of fixed interest rate debt as a percentage of aggregate debt outstanding.No definition available.false0Percentage of fixed rate/hedged total debt9false 4are_VariableInterestRateDebtAsPercentageOfTotalOutstandingBalanceare_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.110.11falsefalsefalsenum:percentItemTypepureRepresents the outstanding balance of variable interest rate debt as a percentage of aggregate debt outstanding.No definition available.false0Percentage of unhedged floating rate total debt10false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2false USDtruefalseD2013Q2YTD_us-gaap_LongtermDebtTypeAxis_us-gaap_SecuredDebtMemberhttp://www.sec.gov/CIK0001035443duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseSecured Debtus-gaap_LongtermDebtTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_SecuredDebtMemberus-gaap_LongtermDebtTypeAxisexplicitMembernumberStandardhttp://www.xbrl.org/2003/instancepurexbrli0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$nanafalse0Secured Debt11true 3us-gaap_DebtInstrumentLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Debt Instrument [Line Items]12false 4us-gaap_LongtermDebtPercentageBearingFixedInterestAmountus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse591623000591623USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.No definition available.false2Fixed Rate/Hedged Variable Rate13false 4us-gaap_LongtermDebtPercentageBearingVariableInterestAmountus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse119406000119406USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.No definition available.false2Unhedged Variable rate14false 4us-gaap_LongTermDebtus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse711029000711029USD$falsefalsefalsexbrli:monetaryItemTypemonetaryCarrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 false2Principal amount15false 4are_DebtInstrumentPercentageOfOutstandingBalanceare_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.2400.240falsefalsefalsenum:percentItemTypepureRepresents the outstanding balance of debt as a percentage of aggregate debt outstanding.No definition available.false0Percentage of Total16false 4us-gaap_DebtWeightedAverageInterestRateus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.05480.0548[1]falsefalsefalsenum:percentItemTypepureReflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.No definition available.false0Weighted average interest rate (as a percent)17false 4are_DebtInstrumentWeightedAverageRemainingPeriodare_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse002 years 8 months 24 daysfalsefalsefalsexbrli:durationItemTypenaRepresents the weighted average remaining term of the debt instrument in years.No definition available.false0Weighted Average Remaining Terms (in years)18false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse3false USDtruefalseD2013Q2YTD_us-gaap_LongtermDebtTypeAxis_us-gaap_SeniorNotesMemberhttp://www.sec.gov/CIK0001035443duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseSenior Notesus-gaap_LongtermDebtTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_SeniorNotesMemberus-gaap_LongtermDebtTypeAxisexplicitMembernumberStandardhttp://www.xbrl.org/2003/instancepurexbrli0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$nanafalse0Senior Notes19true 3us-gaap_DebtInstrumentLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Debt Instrument [Line Items]20false 4us-gaap_LongtermDebtPercentageBearingFixedInterestAmountus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse10483950001048395USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.No definition available.false2Fixed Rate/Hedged Variable Rate21false 4us-gaap_LongtermDebtPercentageBearingVariableInterestAmountus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse00USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.No definition available.false2Unhedged Variable rate22false 4us-gaap_LongTermDebtus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse10483950001048395USD$falsefalsefalsexbrli:monetaryItemTypemonetaryCarrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 false2Principal amount23false 4are_DebtInstrumentPercentageOfOutstandingBalanceare_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.3540.354falsefalsefalsenum:percentItemTypepureRepresents the outstanding balance of debt as a percentage of aggregate debt outstanding.No definition available.false0Percentage of Total24false 4us-gaap_DebtWeightedAverageInterestRateus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.04290.0429[1]falsefalsefalsenum:percentItemTypepureReflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.No definition available.false0Weighted average interest rate (as a percent)25false 4are_DebtInstrumentWeightedAverageRemainingPeriodare_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse009 years 3 months 24 daysfalsefalsefalsexbrli:durationItemTypenaRepresents the weighted average remaining term of the debt instrument in years.No definition available.false0Weighted Average Remaining Terms (in years)26false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse4false USDtruefalseD2013Q2YTD_us-gaap_LongtermDebtTypeAxis_us-gaap_LineOfCreditMemberhttp://www.sec.gov/CIK0001035443duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseLine of Creditus-gaap_LongtermDebtTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_LineOfCreditMemberus-gaap_LongtermDebtTypeAxisexplicitMembernumberStandardhttp://www.xbrl.org/2003/instancepurexbrli0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$nanafalse0Line of Credit27true 3us-gaap_DebtInstrumentLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Debt Instrument [Line Items]28false 4us-gaap_LongtermDebtPercentageBearingFixedInterestAmountus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse00USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.No definition available.false2Fixed Rate/Hedged Variable Rate29false 4us-gaap_LongtermDebtPercentageBearingVariableInterestAmountus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse00USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.No definition available.false2Unhedged Variable rate30false 4us-gaap_LongTermDebtus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse00USD$falsefalsefalsexbrli:monetaryItemTypemonetaryCarrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 false2Principal amount31false 4are_DebtInstrumentPercentageOfOutstandingBalanceare_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.0000.000falsefalsefalsenum:percentItemTypepureRepresents the outstanding balance of debt as a percentage of aggregate debt outstanding.No definition available.false0Percentage of Total32false 4us-gaap_DebtWeightedAverageInterestRateus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.01390.0139[1]falsefalsefalsenum:percentItemTypepureReflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.No definition available.false0Weighted average interest rate (as a percent)33false 4are_DebtInstrumentWeightedAverageRemainingPeriodare_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse003 years 9 months 24 daysfalsefalsefalsexbrli:durationItemTypenaRepresents the weighted average remaining term of the debt instrument in years.No definition available.false0Weighted Average Remaining Terms (in years)34false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse5false USDtruefalseD2013Q2YTD_us-gaap_LongtermDebtTypeAxis_are_UnsecuredBankTermLoan2016Memberhttp://www.sec.gov/CIK0001035443duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseUnsecured Bank Term Loan 2016us-gaap_LongtermDebtTypeAxisxbrldihttp://xbrl.org/2006/xbrldiare_UnsecuredBankTermLoan2016Memberus-gaap_LongtermDebtTypeAxisexplicitMembernumberStandardhttp://www.xbrl.org/2003/instancepurexbrli0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$nanafalse0Unsecured Bank Term Loan 201635true 3us-gaap_DebtInstrumentLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Debt Instrument [Line Items]36false 4us-gaap_LongtermDebtPercentageBearingFixedInterestAmountus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse400000000400000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.No definition available.false2Fixed Rate/Hedged Variable Rate37false 4us-gaap_LongtermDebtPercentageBearingVariableInterestAmountus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse200000000200000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.No definition available.false2Unhedged Variable rate38false 4us-gaap_LongTermDebtus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse600000000600000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryCarrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 false2Principal amount39false 4are_DebtInstrumentPercentageOfOutstandingBalanceare_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.2030.203falsefalsefalsenum:percentItemTypepureRepresents the outstanding balance of debt as a percentage of aggregate debt outstanding.No definition available.false0Percentage of Total40false 4us-gaap_DebtWeightedAverageInterestRateus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.02240.0224[1]falsefalsefalsenum:percentItemTypepureReflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.No definition available.false0Weighted average interest rate (as a percent)41false 4are_DebtInstrumentWeightedAverageRemainingPeriodare_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse003 years 0 months 10 daysfalsefalsefalsexbrli:durationItemTypenaRepresents the weighted average remaining term of the debt instrument in years.No definition available.false0Weighted Average Remaining Terms (in years)42false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse6false USDtruefalseD2013Q2YTD_us-gaap_LongtermDebtTypeAxis_are_UnsecuredBankTermLoan2017Memberhttp://www.sec.gov/CIK0001035443duration2013-01-01T00:00:002013-06-30T00:00:00falsefalse2017 Unsecured Senior Bank Term Loanus-gaap_LongtermDebtTypeAxisxbrldihttp://xbrl.org/2006/xbrldiare_UnsecuredBankTermLoan2017Memberus-gaap_LongtermDebtTypeAxisexplicitMembernumberStandardhttp://www.xbrl.org/2003/instancepurexbrli0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$nanafalse02017 Unsecured Senior Bank Term Loan43true 3us-gaap_DebtInstrumentLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Debt Instrument [Line Items]44false 4us-gaap_LongtermDebtPercentageBearingFixedInterestAmountus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse600000000600000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.No definition available.false2Fixed Rate/Hedged Variable Rate45false 4us-gaap_LongtermDebtPercentageBearingVariableInterestAmountus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse00USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.No definition available.false2Unhedged Variable rate46false 4us-gaap_LongTermDebtus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse600000000600000USD$falsetruefalsexbrli:monetaryItemTypemonetaryCarrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 false2Principal amount47false 4are_DebtInstrumentPercentageOfOutstandingBalanceare_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.2030.203falsefalsefalsenum:percentItemTypepureRepresents the outstanding balance of debt as a percentage of aggregate debt outstanding.No definition available.false0Percentage of Total48false 4us-gaap_DebtWeightedAverageInterestRateus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.03930.0393[1]falsefalsefalsenum:percentItemTypepureReflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.No definition available.false0Weighted average interest rate (as a percent)49false 4are_DebtInstrumentWeightedAverageRemainingPeriodare_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse003 years 7 months 10 daysfalsefalsefalsexbrli:durationItemTypenaRepresents the weighted average remaining term of the debt instrument in years.No definition available.false0Weighted Average Remaining Terms (in years)1Represents the weighted average contractual interest rate as of the end of the period plus the impact of debt premiums/discounts and our interest rate swap agreements. The weighted average interest rate excludes bank fees and amortization of loan fees.falseSecured and unsecured senior debt Schedule of secured and unsecured senior debts (Details) (USD $)ThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.are.com/role/SecuredAndUnsecuredSeniorDebtScheduleOfSecuredAndUnsecuredSeniorDebtsDetails149