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Debt Schedule of Maturities of Long-term Debt (Details) (Mortgages [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
2015 amortization | $ 11,772 esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinNextTwelveMonthsPortionAttributabletoAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
2016 amortization | 12,387 esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearTwoPortionAttributabletoAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
2017 amortization | 10,070 esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearThreePortionAttributabletoAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
2018 amortization | 2,880 esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearFourPortionAttributabletoAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
2019 amortization | 14,163 esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearFivePortionAttributabletoAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
Total amortization | 51,272 esrt_LongtermDebtMaturitiesRepaymentsofPrincipalPortionAttributabletoAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
2015 maturities | 44,146 esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinNextTwelveMonthsPrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
2016 maturities | 0 esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearTwoPrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
2017 maturities | 616,760 esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearThreePrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
2018 maturities | 562,210 esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearFourPrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
2019 maturities | 327,674 esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearFivePrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
Total maturities | 1,550,790 esrt_LongtermDebtMaturitiesRepaymentsofPrincipalPrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
2015 | 55,918 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
2016 | 12,387 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
2017 | 626,830 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
2018 | 565,090 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
2019 | 341,837 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
Total | $ 1,602,062 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | $ 1,196,419 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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