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Mortgage Notes Payable, Unsecured Notes and Credit Facility (Details 2) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Aug. 31, 2018 | Jun. 30, 2018 | Apr. 30, 2018 | Mar. 31, 2018 | Feb. 28, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Gains (losses) on extinguishment of debt |  |  |  |  |  |  | $ (17,492,000) | $ (25,472,000) | $ (7,075,000)
Repayment of unsecured debt |  |  |  |  |  |  | $ 258,579,000 | $ 300,000,000 | $ 504,403,000
Mortgage notes payable | Notes Payable Maturities 2043 |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Repayments of secured debt |  |  |  |  |  | $ 15,174,000 |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 6.60% |  |  |
Gains (losses) on extinguishment of debt |  |  |  |  |  | $ 426,000 |  |  |
Prepayment penalty |  |  |  |  |  | (152,000) |  |  |
Write off of deferred debt issuance cost |  |  |  |  |  | (274,000) |  |  |
Mortgage notes payable | Notes Payable Maturities 2018 |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Repayments of secured debt |  | $ 51,449,000 |  | $ 13,380,000 |  | $ 11,038,000 |  |  |
Stated interest rate (as a percent) |  |  |  | 3.06% |  | 4.61% |  |  |
Mortgage notes payable | Notes Payable Maturities 2033 |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Repayments of secured debt |  |  | $ 15,295,000 |  |  |  |  |  |
Stated interest rate (as a percent) |  |  | 6.90% |  |  |  |  |  |
Gains (losses) on extinguishment of debt |  |  | $ 635,000 |  |  |  |  |  |
Prepayment penalty |  |  | (282,000) |  |  |  |  |  |
Write off of deferred debt issuance cost |  |  | $ (353,000) |  |  |  |  |  |
Mortgage notes payable | Notes Payable Maturities 2028 |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Repayments of secured debt |  | 44,410,000 |  |  |  |  |  |  |
Gains (losses) on extinguishment of debt |  | 1,690,000 |  |  |  |  |  |  |
Mortgage notes payable | Notes Payable Maturities 2018 and 2028 |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Repayments of secured debt |  | $ 95,859,000 |  |  |  |  |  |  |
Mortgage notes payable | Notes Payable Maturities 2037 |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Repayments of secured debt | $ 93,800,000 |  |  |  |  |  |  |  |
Gains (losses) on extinguishment of debt | 5,837,000 |  |  |  |  |  |  |  |
Prepayment penalty | (2,874,000) |  |  |  |  |  |  |  |
Write off of deferred debt issuance cost | $ (2,963,000) |  |  |  |  |  |  |  |
Unsecured Notes 4.35 Percent |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Net proceeds from issuance of debt |  |  |  |  | $ 296,210,000 |  |  |  |
Principal amount of notes issued |  |  |  |  | $ 300,000,000 |  |  |  |
Unsecured notes | Unsecured Notes 4.35 Percent |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 4.35% |  |  |  |
Unsecured notes | Unsecured Notes 3.97 Percent First 10 Years |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  | 10 years |  |  |  |
Debt instrument, interest rate, effective percentage |  |  |  |  | 3.97% |  |  |  |
Unsecured notes | Unsecured Notes 4.39 Percent Remaining 20 Years |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, effective percentage |  |  |  |  | 4.39% |  |  |  |
Unsecured notes | Notes Payable Maturities 2028 |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 3.20% |  |  |  |  |  | 3.20% |  |
Unsecured notes | Notes Payable 6.100 Maturities 2020 |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 6.10% |  |  |  |  |  | 6.10% |  |
Gains (losses) on extinguishment of debt | $ 8,926,000 |  |  |  |  |  |  |  |
Prepayment penalty | (8,579,000) |  |  |  |  |  |  |  |
Write off of deferred debt issuance cost | (347,000) |  |  |  |  |  |  |  |
Repayment of unsecured debt | $ 250,000,000 |  |  |  |  |  |  |  |
Avalon Bowery Place I | Mortgage notes payable | Notes Payable Maturities 2029 |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 4.01% |  |  |  |  |  | 4.01% |  |
Principal amount of notes issued | $ 93,800,000 |  |  |  |  |  | $ 93,800,000 |  |
Avalon Bowery Place II | Mortgage notes payable | Notes Payable Maturities 2029 |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 4.01% |  |  |  |  |  | 4.01% |  |
Principal amount of notes issued | $ 39,639,000 |  |  |  |  |  | $ 39,639,000 |  |
Avalon Morningside Park | Mortgage notes payable | Notes Payable 3.95 Maturities 2029 |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 3.95% |  |  |  |  |  | 3.95% |  |
Principal amount of notes issued | $ 12,500,000 |  |  |  |  |  | $ 12,500,000 |  |
Avalon Morningside Park | Mortgage notes payable | Notes Payable 3.50 Maturities 2029 |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 3.50% |  |  |  |  |  | 3.50% |  |
Principal amount of notes issued | $ 100,000,000 |  |  |  |  |  | $ 100,000,000 |  |
Avalon West Chelsea and AVA High Line | Mortgage notes payable | Notes Payable Maturities 2029 |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 4.01% |  |  |  |  |  | 4.01% |  |
Principal amount of notes issued | $ 150,000,000 |  |  |  |  |  | $ 150,000,000 |  |
NYC JV | Mortgage notes payable | Notes Payable Maturities 2029 |  |  |  |  |  |  |  |  |
Mortgage Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Principal amount of notes issued | $ 295,939,000 |  |  |  |  |  | $ 295,939,000 |  |

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