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Notes Payable, Unsecured Notes and Credit Facility (Details 2) (USD $)
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12 Months Ended | 1 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Nov. 30, 2012
Unsecured notes
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Dec. 31, 2012
Unsecured notes
Minimum
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Dec. 31, 2012
Unsecured notes
Maximum
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Dec. 31, 2012
Mortgage notes payable
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Jan. 31, 2012
5.5% notes payable maturing in 2012
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Feb. 29, 2012
4.61% fixed-rate mortgage note
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May 31, 2012
Variable rate secured mortgage note
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Feb. 29, 2012
Variable rate secured mortgage note
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Dec. 31, 2012
Variable rate unsecured credit facility
option
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Dec. 31, 2011
Variable rate unsecured credit facility
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Sep. 30, 2011
Variable rate unsecured credit facility
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Dec. 31, 2012
Variable rate unsecured credit facility
Minimum
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Dec. 31, 2012
Variable rate unsecured credit facility
Maximum
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Dec. 31, 2012
Fixed rate mortgage notes payable
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Dec. 31, 2011
Fixed rate mortgage notes payable
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Dec. 31, 2012
Variable rate mortgage notes payable and Credit Facility
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Dec. 31, 2011
Variable rate mortgage notes payable and Credit Facility
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May 31, 2012
Other
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Dec. 31, 2012
2.85% unsecured notes maturing in September 2023
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Dec. 31, 2012
2.85% unsecured notes maturing in September 2023
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Sep. 30, 2012
2.95% unsecured notes maturing in September 2022
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| Notes Payable, Unsecured Notes and Credit Facility | |||||||||||||||||||||||
| Stated interest rate, percentage | 6.125% | 5.50% | 4.61% | 2.85% | 2.85% | 2.95% | |||||||||||||||||
| Principal amount of debt repaid | $ 201,601,000 | $ 179,400,000 | $ 14,566,000 | $ 48,500,000 | $ 33,100,000 | ||||||||||||||||||
| Debt assumed | 11,958,000 | ||||||||||||||||||||||
| Loss on extinguishment of debt, net | 1,179,000 | 1,940,000 | 1,179,000 | ||||||||||||||||||||
| Loss on extinguishment of debt, net | 602,000 | 3,880,000 | 602,000 | ||||||||||||||||||||
| Principal amount of unsecured notes issued | 250,000,000 | 450,000,000 | |||||||||||||||||||||
| Effective interest rate, percentage | 3.00% | 4.30% | |||||||||||||||||||||
| Available borrowing capacity | 1,300,000,000 | 750,000,000 | |||||||||||||||||||||
| Line of credit facility, extension options | 2 | ||||||||||||||||||||||
| Line of credit facility, additional extension period | 6 months | ||||||||||||||||||||||
| Line of credit facility, extension period | 1 year | ||||||||||||||||||||||
| Additional borrowing capacity | 550,000,000 | ||||||||||||||||||||||
| Debt instrument variable rate | LIBOR | ||||||||||||||||||||||
| Debt instrument, basis spread on variable rate (as a percent) | 0.25% | 0.45% | 1.25% | 0.95% | 1.725% | ||||||||||||||||||
| Current interest rate (as a percent) | 1.05% | ||||||||||||||||||||||
| Maximum borrowing capacity under competitive bid option | 65.00% | ||||||||||||||||||||||
| Annual facility fee rate (as a percent) | 0.175% | 0.15% | |||||||||||||||||||||
| Annual facility fee | 1,950,000 | ||||||||||||||||||||||
| Outstanding balance of letters of credit | 44,883,000 | 52,659,000 | |||||||||||||||||||||
| Net carrying value of apartment communities and improved land parcels securing debt | 1,513,526,000 | ||||||||||||||||||||||
| Mortgage notes payable held by wholly owned subsidiaries guaranteed by the Company | 245,787,000 | ||||||||||||||||||||||
| Weighted average interest rate, debt (as a percent) | 5.80% | 5.70% | 2.70% | 2.30% | |||||||||||||||||||
| Extension fee | $ 975,000 | ||||||||||||||||||||||