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Mortgage Notes Payable, Unsecured Notes and Credit Facility (Details 2) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | May 31, 2017 USD ($) community | Feb. 28, 2017 USD ($) | Sep. 30, 2017 USD ($) community | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) community | Sep. 30, 2016 USD ($) | Apr. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Number of operating apartment communities | community |  |  |  | 263 |  | 263 |  |  |
Loss on extinguishment of debt, net |  |  |  | $ 0 | $ 0 | $ 24,162,000 | $ 2,461,000 |  |
Credit Facility |  |  |  | 242,000,000 |  | 242,000,000 |  |  | $ 0
Net carrying value of apartment communities and improved land parcels securing debt |  |  |  | 2,204,341,000 |  | 2,204,341,000 |  |  |
Unsecured Notes 4.15 Percent |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | 300,000,000 |  | 300,000,000 |  |  |
Proceeds from issuance of debt | $ 297,372,000 |  |  |  |  |  |  |  |
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 3.35 Percent |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 400,000,000 |  |  |  |  |  |  |
Proceeds from issuance of debt |  | 396,016,000 |  |  |  |  |  |  |
Notes Payable Maturities 2017 | Mortgage notes payable |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Repayments of secured mortgages |  | $ 670,590,000 | $ 17,300,000 |  |  |  |  |  |
Number of operating apartment communities | community |  | 11 |  |  |  |  |  |  |
Stated interest rate of unsecured notes (as a percent) |  | 6.256% |  |  |  |  |  |  |
Loss on extinguishment of debt, net |  | $ (10,839,000) |  |  |  |  |  |  |
Variable Rate Unsecured Term Loan $250 Million |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 250,000,000 |
Variable Rate Unsecured Term Loan $100 Million |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | 100,000,000 |  |  |  |  |  |
Variable Rate Unsecured Term Loan $100 Million | LIBOR |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt instrument variable rate |  |  |  | LIBOR |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  | 0.90% |  |  |  |  |
Variable Rate Unsecured Term Loan $100 Million | LIBOR | Unsecured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt instrument variable rate |  |  |  |  |  | LIBOR |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  | 0.90% |  |  |
Variable Rate Unsecured Term Loan $150 Million |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 150,000,000 |  |  |  |  |  |
Variable Rate Unsecured Term Loan $150 Million | LIBOR |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt instrument variable rate |  |  |  | LIBOR |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  | 1.50% |  |  |  |  |
Variable Rate Unsecured Term Loan $150 Million | LIBOR | Unsecured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt instrument variable rate |  |  |  |  |  | LIBOR |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  | 1.50% |  |  |
Notes Payable Maturities 2027 | Unsecured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Stated interest rate of unsecured notes (as a percent) |  |  |  | 3.35% |  | 3.35% |  |  |
Notes Payable Maturities 2027 | Mortgage notes payable |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 185,100,000 |  |  |  |  |  |  |
Number of operating apartment communities | community |  | 3 |  |  |  |  |  |  |
Stated interest rate of unsecured notes (as a percent) |  | 3.61% |  |  |  |  |  |  |
Notes Payable 3.350 Maturities 2027 | Unsecured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Stated interest rate of unsecured notes (as a percent) |  | 3.35% |  |  |  |  |  |  |
Unsecured Notes 4.15 Percent | Unsecured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Stated interest rate of unsecured notes (as a percent) |  |  |  | 4.15% |  | 4.15% |  |  |
Notes Payable Maturities 2019 | Mortgage notes payable |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Repayments of secured mortgages | 556,313,000 |  |  |  |  |  |  |  |
Number of operating apartment communities | community |  |  |  | 12 |  | 12 |  |  |
Stated interest rate of unsecured notes (as a percent) |  |  |  | 5.86% |  | 5.86% |  |  |
Loss on extinguishment of debt, net | 34,965,000 |  |  |  |  |  |  |  |
Prepayment penalty | (33,515,000) |  |  |  |  |  |  |  |
Write off of deferred debt issuance cost | $ (1,450,000) |  |  |  |  |  |  |  |
Variable rate unsecured credit facility |  |  |  |  |  |  |  |  |
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 |  |  |  | 242,000,000 |  | 242,000,000 |  |  | 0
Outstanding balance of letters of credit |  |  |  | $ 44,282,000 |  | $ 44,282,000 |  |  | $ 46,711,000
Variable rate unsecured credit facility | LIBOR |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Debt instrument variable rate |  |  |  |  |  | LIBOR |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  | 0.825% |  |  |
Current interest rate (as a percent) |  |  |  | 2.06% |  | 2.06% |  |  |
Fixed rate mortgage notes payable |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Weighted average interest rate, debt (as a percent) |  |  |  | 4.00% |  | 4.00% |  |  | 4.40%
Variable rate mortgage notes payable, unsecured term loan and Credit Facility |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Weighted average interest rate, debt (as a percent) |  |  |  | 2.60% |  | 2.60% |  |  | 2.30%

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