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Consolidated Statements of Equity (Parenthetical) | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance (in shares) | 80,952,986 | 72,011,324
Conversion of common units to common shares | 279,019 | 54,550
Exercise of share options | 32,756 | 12,667
Restricted common share redemptions | 68,762 | 133,081
Balance (in shares) | 85,845,403 | 72,084,932
Preferred Shares |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Shares issued to the public (in shares) |  | 6,900,000
Stock redeemed or called during period, shares | 3,390,000 |
Common Shares |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Shares issued to the public (in shares) | 4,485,000 |

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