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Common Shares (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended |  | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2012 | Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011 | Mar. 31, 2010 2010 ATM Program [Member] | Mar. 31, 2011 2010 ATM Program [Member] | Apr. 27, 2012 2011 ATM Program [Member] | May 31, 2011 2011 ATM Program [Member] | Mar. 31, 2012 2011 ATM Program [Member] | May 31, 2012 2012 ATM Program [Member] | Jan. 31, 2012 January 2012 Public Equity Offering [Member]
Maximum aggregate offering price of common shares |  |  |  |  | $ 250,000,000 |  |  | $ 300,000,000 |  | $ 300,000,000 |
Maximum aggregate offering price of remaining common shares available for sale |  |  |  |  |  |  | 132,600,000 |  | 160,600,000 |  |
Common shares sold |  |  |  |  |  | 71,300 | 400,000 |  | 704,200 |  | 6,612,500
Total net consideration |  | $ 435,911,000 | $ 3,795,000 |  |  | $ 3,794,600 | $ 27,600,000 |  | $ 44,291,700 |  | $ 391,600,000
Number of common and preferred stock authorized to issue |  | 110,000,000 |  |  |  |  |  |  |  |  |
Common shares, authorized |  | 100,000,000 |  | 100,000,000 |  |  |  |  |  |  |
Preferred shares, authorized |  | 10,000,000 |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired | 80.00% |  |  |  |  |  |  |  |  |  |
Number of unconsolidated equity method investments acquired | 12 | 12 |  |  |  |  |  |  |  |  |

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