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Fair Value (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | May 31, 2017 USD ($) | Apr. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) community venture derivative | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) community derivative | Sep. 30, 2016 USD ($)
Derivative instruments and Hedging Activities |  |  |  |  |  |  |
Gain on fair value hedge ineffectiveness |  |  |  |  |  | $ (753,000) |
Derivative, notional amounts settled during period | $ 214,900,000 | $ 400,000,000 | $ 185,100,000 |  |  | 800,000,000 |
Receipts (payments) for termination of forward interest rate swaps | $ 4,078,000 | $ (1,361,000) | $ (2,326,000) |  |  | $ (391,000) | $ 14,847,000
Number of operating apartment communities | community |  |  |  | 263 |  | 263 |
Estimated hedging losses to be reclassified from accumulated other comprehensive loss into earnings within the next twelve months |  |  |  |  |  | $ 376,000 |
Amortization period of deferred gain (loss) on discontinuation of interest rate fair value hedge |  |  |  |  |  | 10 years |
Income (loss) on cash flow hedges |  |  |  | $ 359,000 | $ 719,000 | $ (15,654,000) | $ (73,826,000)
Cash Flow Hedges |  |  |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |  |  |
Number of derivative instruments held | derivative |  |  |  | 7 |  | 7 |
Interest Rate Cap | Cash Flow Hedges |  |  |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |  |  |
Notional amount |  |  |  | $ 35,256,000 |  | $ 35,256,000 |
Interest Rate Swap | Cash Flow Hedges |  |  |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |  |  |
Notional amounts entered into during period |  |  |  | 50,000,000 |  | 300,000,000 |
Notional amount |  |  |  | $ 300,000,000 |  | $ 300,000,000 |
Put Option |  |  |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |  |  |
Number of ventures in which entity is required to purchase interest in investment at guaranteed minimum amount | venture |  |  |  | 3 |  |  |
Not Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |  |  |
Number of derivative instruments held | derivative |  |  |  | 14 |  | 14 |
Not Designated as Hedging Instrument | Interest Rate Cap |  |  |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |  |  |
Notional amount |  |  |  | $ 690,053,000 |  | $ 690,053,000 |
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |  |  |
Estimated hedging losses to be reclassified from accumulated other comprehensive loss into earnings within the next twelve months |  |  |  |  |  | $ 7,012,000 |

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