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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $) | 6 Months Ended
--- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2013 Archstone Enterprise LP
Supplemental disclosures of non-cash investing and financing activities |  |  |
Stock issued in connection with stock grants (in shares) | 113,822 | 123,977 |
Number of shares of common stock issued as partial consideration for acquisition |  |  | 14,889,706
Value of shares of common stock issued as partial consideration for acquisition |  |  | $ 1,875,210,000
Increase in redeemable noncontrolling interests associated with business acquisition |  |  | 13,262,000
Assumed principal amount of indebtedness |  |  | 3,512,202,000
Obligation related to outstanding preferred interests |  |  | 67,500,000
Stock issued in connection with stock grants, value |  | 16,019,000 |
Common stock issued through the dividend reinvestment plan (in shares) | 1,286 | 1,030 |
Common stock issued through the dividend reinvestment plan | 165,000 | 140,000 |
Number of shares withheld to satisfy employees' tax withholding and other liabilities | 50,105 | 44,222 |
Shares withheld to satisfy employees' tax withholding and other liabilities, value | 4,689,000 | 5,638,000 |
Dividends declared but not paid | 152,113,000 | 138,456,000 |
(Decrease) increase in redeemable noncontrolling interests | (626,000) | 329,000 |
Cash flow hedge losses reclassified to earnings | 3,011,000 | 2,965,000 |
Noncontrolling interests derecognition | (17,816,000) |  |
Number of shares forfeited |  | 5,214 |
Shares cancelled upon forfeiture | 1,284,000 | 516,000 |
Number of options granted for common stock |  | 215,230 |
Options granted for common stock, value |  | 5,768,000 |
Decrease in interest expense, net |  | 2,484,000 |
Cash flow hedge losses reclassified to interest expense, net |  | $ 2,965,000 |

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