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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, 2018 | Jun. 30, 2018 | Apr. 30, 2018 | Mar. 31, 2018 | Feb. 28, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt, net |  |  |  |  |  | $ 1,678,000 | $ 0 | $ 2,717,000 | $ 24,162,000 |
Credit Facility |  |  |  |  |  | 56,000,000 |  | 56,000,000 |  | $ 0
Net carrying value of apartment communities and improved land parcels securing debt |  |  |  |  |  | 2,073,747,000 |  | 2,073,747,000 |  |
Mortgage notes payable |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Mortgage notes payable held by wholly owned subsidiaries guaranteed by the Company |  |  |  |  |  | 100,000,000 |  | 100,000,000 |  |
Unsecured Notes 4.35 Percent [Member] |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 300,000,000 |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  | $ 296,210,000 |  |  |  |  |  |
Unsecured Notes 3.97 Percent First 10 Years [Member] | Unsecured notes |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 10 years |  |  |  |  |  |
Current interest rate (as a percent) |  |  |  | 3.97% |  |  |  |  |  |
Unsecured Notes 4.39 Percent Remaining 20 Years [Member] | Unsecured notes |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Current interest rate (as a percent) |  |  |  | 4.39% |  |  |  |  |  |
Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  |  |  |  | 1,500,000,000 |  | $ 1,500,000,000 |  |
Line of credit facility, extension period |  |  |  |  |  |  |  | 9 months |  |
Extension fee |  |  |  |  |  |  |  | $ 1,500,000 |  |
Period of borrowing rate assumed |  |  |  |  |  |  |  | 1 month |  |
Annual facility fee, percentage |  |  |  |  |  |  |  | 0.125% |  |
Annual facility fee |  |  |  |  |  |  |  | $ 1,875,000 |  |
Credit Facility |  |  |  |  |  | 56,000,000 |  | 56,000,000 |  | 0
Outstanding balance of letters of credit |  |  |  |  |  | $ 39,760,000 |  | $ 39,760,000 |  | $ 47,315,000
Line of Credit [Member] | LIBOR |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  |  |  | 0.825% |  |
Current interest rate (as a percent) |  |  |  |  |  | 3.08% |  | 3.08% |  |
Notes Payable Maturities 2043 [Member] | Mortgage notes payable |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Repayments of secured mortgages |  |  |  |  | $ 15,174,000 |  |  |  |  |
Stated interest rate of unsecured notes (as a percent) |  |  |  |  | 6.60% |  |  |  |  |
Loss on extinguishment of debt, net |  |  |  |  | $ (426,000) |  |  |  |  |
Prepayment penalty |  |  |  |  | 152,000 |  |  |  |  |
Write off of deferred debt issuance cost |  |  |  |  | 274,000 |  |  |  |  |
Notes Payable Maturities 2018 | Mortgage notes payable |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Repayments of secured mortgages | $ 51,449,000 |  | $ 13,380,000 |  | $ 11,038,000 |  |  |  |  |
Stated interest rate of unsecured notes (as a percent) |  |  | 3.06% |  | 4.61% |  |  |  |  |
Notes Payable Maturities 2033 [Member] | Mortgage notes payable |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Repayments of secured mortgages |  | $ 15,295,000 |  |  |  |  |  |  |  |
Stated interest rate of unsecured notes (as a percent) |  | 6.90% |  |  |  |  |  |  |  |
Loss on extinguishment of debt, net |  | $ (635,000) |  |  |  |  |  |  |  |
Prepayment penalty |  | 282,000 |  |  |  |  |  |  |  |
Write off of deferred debt issuance cost |  | $ 353,000 |  |  |  |  |  |  |  |
Unsecured Notes 4.35 Percent [Member] | Unsecured notes |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Stated interest rate of unsecured notes (as a percent) |  |  |  | 4.35% |  |  |  |  |  |
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% |  | 4.00%
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) |  |  |  |  |  | 3.40% |  | 3.40% |  | 3.20%

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + 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=6877327&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=6876686&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=6879938&loc=d3e572229-122910 + Details
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