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Mortgage Notes Payable, Unsecured Notes and Credit Facility (Details 2) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2016 | Oct. 31, 2016 | Sep. 30, 2016 | May 31, 2016 | Apr. 30, 2016 | Feb. 29, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jan. 31, 2016
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Repayments of Unsecured Debt |  |  |  |  |  |  | $ 504,403,000 | $ 0 | $ 150,000,000 |
Gains (losses) on extinguishment of debt |  |  |  |  |  |  | $ 7,075,000 | (26,736,000) | $ 412,000 |
Variable rate unsecured credit facility | LIBOR |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  | 1.60% |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  |  | 0.825% |  |  |
Notes payable maturing in 2017 |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Gains (losses) on extinguishment of debt | $ 4,614,000 |  |  |  |  |  |  |  |  |
Notes Payable Maturities 2046 [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Gains (losses) on extinguishment of debt |  |  |  |  | $ 2,461,000 |  |  |  |  |
Unsecured notes |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Repayments of Unsecured Debt | $ 250,000,000 |  | $ 250,000,000 |  |  |  |  |  |  |
Fixed rate (as a percent) | 5.70% |  | 5.75% |  |  |  |  |  |  |
Unsecured notes | Term loan | LIBOR |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  |  | 1.45% |  |  |
Unsecured notes | Notes Payable 2.900 Maturities 2026 [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 2.90% |  |  |  |  | 2.90% |  |  |
Unsecured notes | Notes Payable Maturities 2046 [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 3.90% |  |  |  |  | 3.90% |  |  |
Unsecured notes | Notes Payable 2.950 Maturities 2026 [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 2.95% |  |  | 2.95% |  |  |
Mortgage notes payable |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Amount drawn |  |  |  |  |  |  | $ 908,262,000 | $ 1,045,182,000 |  |
Mortgage notes payable | Notes payable maturing in 2017 |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Prepayment Penalty |  |  |  |  |  |  | 4,403,000 |  |  |
Write off of Deferred Debt Issuance Cost |  |  |  |  |  |  | $ 211,000 |  |  |
Mortgage notes payable | Notes payable maturing in 2016 |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  | 3.32% |  |  |  |
Repayments of secured mortgages |  |  |  |  |  | $ 16,212,000 |  |  |  |
Mortgage notes payable | Notes Payable Maturities 2046 [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Repayments of secured mortgages |  |  |  |  | $ 134,500,000 |  |  |  |  |
Unsecured Notes 2.95 Percent [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Principal amount of notes issued |  |  |  | $ 475,000,000 |  |  |  |  |  |
Net proceeds from issuance of debt |  |  |  | $ 471,751,000 |  |  |  |  |  |
Unsecured Notes 2.90 Percent [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Principal amount of notes issued |  | $ 300,000,000 |  |  |  |  |  |  |  |
Net proceeds from issuance of debt |  | 297,117,000 |  |  |  |  |  |  |  |
Unsecured Notes 3.90 Percent [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Principal amount of notes issued |  | 350,000,000 |  |  |  |  |  |  |  |
Net proceeds from issuance of debt |  | $ 345,520,000 |  |  |  |  |  |  |  |
Avalon Hoboken [Member] | Mortgage notes payable | Notes Payable Maturities 2020 [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Assumed principal amount of indebtedness |  |  |  |  |  |  |  |  |  | $ 67,904,000
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  |  | 4.18%
Avalon Columbia Pike [Member] | Mortgage notes payable | Notes Payable Maturities 2019 [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Assumed principal amount of indebtedness |  |  | $ 70,507,000 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 3.38% |  |  |  |  |  |  |

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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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