v2.4.0.6

Shareholders Equity of the REIT (Details Textual) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2011 | Mar. 31, 2012 | Jun. 30, 2011 | Dec. 31, 2011 Stock | Dec. 31, 2011 Stock | Dec. 31, 2010 | Dec. 31, 2009 | Jun. 03, 2011 | Jun. 02, 2011 | Dec. 31, 2011 6.5% Series L Cumulative Redeemable Preferred Units [Member] | Dec. 31, 2011 6.75% series M Cumulative Redeemable Preferred Units [Member] | Dec. 31, 2011 7.00% series O Cumulative Redeemable Preferred Units [Member] | Dec. 31, 2011 6.85% series P Cumulative Redeemable Preferred Units [Member] | Dec. 31, 2011 8.54% series Q Cumulative Redeemable Preferred Units [Member] | Dec. 31, 2011 6.75% series R Cumulative Redeemable Preferred Units [Member] | Dec. 31, 2011 6.75% series S Cumulative Redeemable Preferred Units [Member] | Dec. 31, 2011 Employee Share Purchase Plan | Mar. 31, 2010 Controlled Offering Program [Member] | Dec. 31, 2011 Common Stock | Dec. 31, 2010 Common Stock | Dec. 31, 2009 Common Stock | Dec. 31, 2008 Common Stock
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  | 459,401,000 | 459,401,000 | 254,482,000 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Common shares issued to public |  |  | 34,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,500,000 | 41,069,000 | 78,031,000 |
Percentage of fee earn from gross proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |
Discounted price of market price of common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |
Aggregate fair value of common shares under employee purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |
Number of common shares issued under employee purchase plan |  |  |  |  |  | 76,000 | 87,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock shares available under Employee Share plan |  |  |  | 4,900,000 | 4,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative redeemable preferred units, issued |  |  |  | 21,300,000 | 21,300,000 |  |  |  |  | 2,000,000 | 2,300,000 | 3,000,000 | 2,000,000 | 2,000,000 | 5,000,000 | 5,000,000 |  |  |  |  |  |
Common stock shares authorized to be issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000,000 |  |  |
Stockholders' Equity of the REIT and Partners' Capital of the Operating Partnership (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion basis of common stock |  |  |  | 0.4464 | 0.4464 | 0.4464 | 0.4464 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restated number of shares post merger |  |  |  |  |  | 254,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares added to reflect outstanding stock of acquired entity |  |  |  |  |  |  |  | 169,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from shares added to reflect outstanding shares of common stock of acquired entity | 1,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from the issue of common stock under share based compensation plans |  |  |  |  | 700,000 | 30,800,000 | 337,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units redeemed under Limited Partnership |  |  |  | 0 | 0 | 100,000 | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REIT Description |  |  |  | five or fewer individuals may not own more than 50% of the value of our outstanding stock at any time during the last half of our taxable year. Therefore, our charter restricts beneficial ownership (or ownership generally attributed to a person under the REIT tax rules) by a person or persons acting as a group, of each of our issued and outstanding common, series L preferred stock, series M preferred stock, series O preferred stock and series P preferred stock, or (ii) series Q preferred stock, series R preferred stock or series S preferred stock that, together with all other capital stock owned or deemed owned by that person, would cause that person to own or be deemed to own more than 9.8% (by value or number of shares, whichever is more restrictive) or our issued and outstanding capital stock. | five or fewer individuals may not own more than 50% of the value of our outstanding stock at any time during the last half of our taxable year. Therefore, our charter restricts beneficial ownership (or ownership generally attributed to a person under the REIT tax rules) by a person or persons acting as a group, of each of our issued and outstanding common, series L preferred stock, series M preferred stock, series O preferred stock and series P preferred stock, or (ii) series Q preferred stock, series R preferred stock or series S preferred stock that, together with all other capital stock owned or deemed owned by that person, would cause that person to own or be deemed to own more than 9.8% (by value or number of shares, whichever is more restrictive) or our issued and outstanding capital stock. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial interest of outstanding shares |  |  |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Individuals need to own the beneficial interest of outstanding shares under REIT code |  |  |  | five or fewer individuals | five or fewer individuals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial interest of outstanding shares by a single person or acting as group |  |  |  | 9.80% | 9.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Trust Requirements Code Description |  |  |  | generally required to make common stock distributions (other than capital gain distributions) to our shareholders at least equal to (i) the sum of (a) 90% of our “REIT taxable income” computed without regard to the dividends paid deduction and net capital gains and (b) 90% of the net income (after tax), if any, from foreclosure property, minus (ii) certain excess non-cash income | generally required to make common stock distributions (other than capital gain distributions) to our shareholders at least equal to (i) the sum of (a) 90% of our “REIT taxable income” computed without regard to the dividends paid deduction and net capital gains and (b) 90% of the net income (after tax), if any, from foreclosure property, minus (ii) certain excess non-cash income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of REIT taxable income computed without regard to the dividends paid deduction and net capital gains |  |  |  | 90.00% | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of net income after tax from foreclosure property |  |  |  | 90.00% | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized to be issued |  |  |  | 600,000,000 | 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash distributions declared |  | $ 0.28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  |  |  | 458,597,000 | 458,597,000 | 254,482,000 |  |  | 571,400,000 |  |  |  |  |  |  |  |  |  | 459,401,000 | 254,482,000 | 211,666,000 | 119,191,000
Common limited partnership units, outstanding |  |  |  | 2,100,000 | 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party ownership interest of common partnership units |  |  |  | 0.45% | 0.45% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of series of preferred stock |  |  |  | 7 | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership restrictions |  |  |  | 25.00% | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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