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Equity (Details) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 29, 2015 $ / shares | Oct. 07, 2015 USD ($) property | Jul. 30, 2015 $ / shares | Apr. 30, 2015 $ / shares | Jan. 29, 2015 $ / shares | Oct. 31, 2015 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) item $ / shares | Sep. 30, 2015 USD ($) item $ / shares | Sep. 30, 2014 $ / shares | Sep. 30, 2015 USD ($) item $ / shares shares | Sep. 30, 2014 USD ($) $ / shares shares | Dec. 31, 2014 USD ($)
Equity |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ / shares |  |  | $ 0.565 | $ 0.565 | $ 0.565 |  |  | $ 0.565 | $ 0.545 | $ 1.695 | $ 1.635 |
Company's common stock issuances |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  | $ 8,006,000 | $ 11,599,000 |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |  |  |  |
Cumulative foreign currency translation adjustment |  |  |  |  |  |  | $ (18,844,000) | $ (18,844,000) |  | (18,844,000) |  | $ (10,747,000)
Unrealized losses on cash flow hedges, net |  |  |  |  |  |  | (9,932,000) | (9,932,000) |  | (9,932,000) |  | (9,624,000)
Supplemental Executive Retirement Plan minimum liability |  |  |  |  |  |  | (3,329,000) | (3,329,000) |  | (3,329,000) |  | (3,537,000)
Unrealized gains on available for sale securities |  |  |  |  |  |  | (345,000) | (345,000) |  | (345,000) |  | 13,000
Total accumulated other comprehensive loss |  |  |  |  |  |  | (32,450,000) | (32,450,000) |  | (32,450,000) |  | (23,895,000)
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |
DownREIT unit, carrying value |  |  |  |  |  |  | 186,133,000 | $ 186,133,000 |  | $ 186,133,000 |  | $ 188,588,000
Maximum sales under equity offering program |  |  |  |  |  |  | $ 750,000,000 |  |  |  |  |
Common stock issued (in shares) | shares |  |  |  |  |  |  |  |  |  | 1,250,000 |  |
Weighted average price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 40.58 | $ 40.58 |  | $ 40.58 |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |
Stock issuance fees and commissions |  |  |  |  |  |  |  |  |  | 1,000,000 |  |
Payments of Stock Issuance Costs |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ / shares | $ 0.565 |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) | shares |  |  |  |  |  | 589,000 |  |  |  |  |  |
Weighted average price (in dollars per share) | $ / shares |  |  |  |  |  | $ 39.20 |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  | $ 23,000,000 |  |  |  |  |  |
Stock issuance fees and commissions |  |  |  |  |  | 350,000 |  |  |  |  |  |
Payments of Stock Issuance Costs |  |  |  |  |  | $ 350,000 |  |  |  |  |  |
HCP Ventures V | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest issued (as a percentage) |  | 49 |  |  |  | 49 |  |  |  |  |  |
Number of Real Estate Properties | property |  | 11 |  |  |  |  |  |  |  |  |  |
Consideration received from sale of noncontrolling interest in HCP Ventures V |  | $ 110,000,000 |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Company's common stock issuances |  |  |  |  |  |  |  |  |  |  |  |
Dividend Reinvestment and Stock Purchase Plan (in shares) | shares |  |  |  |  |  |  |  |  |  | 2,345,000 | 1,775,000 |
Conversion of DownREIT units (in shares) | shares |  |  |  |  |  |  |  |  |  | 75,000 | 2,000 |
Exercise of stock options (in shares) | shares |  |  |  |  |  |  |  |  |  | 820,000 | 131,000 |
Vesting of restricted stock units (in shares) | shares |  |  |  |  |  |  |  |  |  | 382,000 | 575,000 |
Repurchase of common stock |  |  |  |  |  |  |  |  |  | $ 178,000 | $ 297,000 |
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) | shares |  |  |  |  |  |  |  |  |  | 4,054,000 | 2,351,000 |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |
Non-managing members DownREIT units outstanding | item |  |  |  |  |  |  | 4,000,000 | 4,000,000 |  | 4,000,000 |  |
Number of DownREIT LLCs | item |  |  |  |  |  |  | 5 | 5 |  | 5 |  |
DownREIT unit, carrying value |  |  |  |  |  |  | $ 186,000,000 | $ 186,000,000 |  | $ 186,000,000 |  |
DownREIT unit, fair value |  |  |  |  |  |  | $ 224,000,000 | $ 224,000,000 |  | $ 224,000,000 |  |

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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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