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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2013 Archstone Enterprise LP
Supplemental disclosures of non-cash investing and financing activities |  |  |
Obligation related to outstanding preferred interests |  |  | $ 67,500,000
Increase in redeemable noncontrolling interests associated with business acquisition |  |  | 13,262,000
Value of shares of common stock issued as partial consideration for acquisition |  |  | 1,875,210,000
Assumed principal amount of indebtedness |  |  | 3,512,202,000
Number of shares of common stock issued as partial consideration for acquisition |  |  | 14,889,706
Stock issued in connection with stock grants (in shares) | 104,060 | 119,292 |
Stock issued in connection with stock grants, value | 13,331,000 | 15,394,000 |
Common stock issued through the dividend reinvestment plan (in shares) | 638 | 550 |
Common stock issued through the dividend reinvestment plan | 78,000 | 76,000 |
Number of shares withheld to satisfy employees' tax withholding and other liabilities | 33,365 | 29,219 |
Shares withheld to satisfy employees' tax withholding and other liabilities, value | 3,567,000 | 3,590,000 |
Number of shares forfeited |  | 9,226 |
Shares cancelled upon forfeiture |  | 780,000 |
Number of options granted for common stock |  | 215,230 |
Options granted for common stock, value |  | 5,768,000 |
Decrease in interest expense, net |  | 1,414,000 |
Common dividends declared but not paid | 150,304,000 | 138,438,000 |
Decrease in other comprehensive income due to a change in other liabilities |  | 1,414,000 |
Cash flow hedge losses reclassified to interest expense, net |  | 1,391,000 |
(Decrease) increase in redeemable noncontrolling interests | (1,081,000) | 526,000 |
Cash flow hedge losses reclassified to earnings | $ 1,573,000 | $ 1,391,000 |

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