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Mortgage Notes Payable, Unsecured Notes and Credit Facility (Details 2) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2020 | May 31, 2020 | Mar. 31, 2020 | Feb. 29, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Repayments of Unsecured Debt |  |  |  |  |  |  | $ 958,681,000 | $ 0 |
Gain (Loss) on Extinguishment of Debt |  |  |  |  | $ 105,000 | $ (93,000) | (9,333,000) | $ (602,000) |
Credit Facility |  |  |  |  | 0 |  | 0 |  | $ 0
Net carrying value of apartment communities and improved land parcels securing debt |  |  |  |  | 1,455,524,000 |  | 1,455,524,000 |  |
Unsecured Notes 2.45 Percent [Member] |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 600,000,000 |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  | 593,430,000 |  |  |  |  |  |  |
Secured Debt [Member] |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Amount |  |  |  |  | 409,649,000 |  | 409,649,000 |  | 479,221,000
Unsecured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Amount |  |  |  |  | 6,500,000,000 |  | 6,500,000,000 |  | 5,850,000,000
Unsecured Notes 2.30 Percent [Member] |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 700,000,000 |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  | $ 694,701,000 |  |  |  |  |
Unsecured Notes 2.30 Percent [Member] | Unsecured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.30% |  |  |  |  |
Floating Rate Unsecured Notes 300 Million [Member] | Unsecured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Repayments of Unsecured Debt |  | 300,000,000 |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | $ 268,000 |  |  |  |  |  |  |
Notes Payable 3.625 Maturities 2020 and 2021 [Member] | Unsecured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  | $ 9,170,000 |  |  |  |  |  |
Unsecured Notes 2.45 Percent [Member] | Unsecured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.45% |  |  |  |  |  |  |
Notes Payable Maturities 2021 [Member] | Unsecured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.95% |  |  |  |  |  |
Repayments of Unsecured Debt |  |  | $ 250,000,000 |  |  |  |  |  |
Notes Payable Maturities 2020 [Member] |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.18% |  |  | 3.08% |  |  |  |  |
Line of Credit [Member] |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  |  |  | 1,750,000,000 |  | $ 1,750,000,000 |  |
Annual facility fee, percentage |  |  |  |  |  |  | 0.125% |  |
Annual facility fee |  |  |  |  |  |  | $ 2,188,000 |  |
Credit Facility |  |  |  |  | 0 |  | 0 |  | 0
Outstanding balance of letters of credit |  |  |  |  | $ 3,752,000 |  | $ 3,752,000 |  | 11,488,000
Line of Credit [Member] | LIBOR |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  |  | 0.775% |  |
Current interest rate (as a percent) |  |  |  |  | 0.92% |  | 0.92% |  |
Other Letter of Credit [Member] |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Outstanding balance of letters of credit |  |  |  |  | $ 31,822,000 |  | $ 31,822,000 |  | $ 24,939,000
Fixed Rate Mortgage Notes Payable [Member] |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Weighted average interest rate, debt (as a percent) |  |  |  |  | 3.80% |  | 3.80% |  | 3.90%
Notes Payable Maturities 2027 |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.38% |  |  |  |  |
Notes Payable Maturities 2027 | Unsecured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 3.35% |  | 3.35% |  |
Notes Payable 3.625 Maturities 2020 [Member] | Unsecured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.625% |  |  |  |  |  |
Repayments of Unsecured Debt |  |  | $ 400,000,000 |  |  |  |  |  |
Variable Rate Mortgage Notes Payable Unsecured Term Loan and Credit Facility [Member] |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Weighted average interest rate, debt (as a percent) |  |  |  |  | 1.70% |  | 1.70% |  | 3.20%
Avalon San Bruno III [Member] | Notes Payable Maturities 2027 | Secured Debt [Member] |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Amount |  |  |  | $ 51,000,000 |  |  |  |  |
Avalon Hoboken [Member] | Notes Payable Maturities 2020, Fixed Rate [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Repayments of Secured Debt | $ 67,904,000 |  |  |  |  |  |  |  |

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120400017&loc=d3e572229-122910 + Details
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