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Consolidated Statements of Equity (Parenthetical)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Balance (in shares) | 72,011,324 | 66,931,582 | 58,342,673 |
| Conversion of common units to common shares | 234,246 | 100,939 | 663,498 |
| Preferred shares redeemed | 2,200,000 | ||
| Exercise of share options | 61,624 | 191,264 | 278,656 |
| Restricted common share redemptions | 139,851 | 114,687 | 105,215 |
| Balance (in shares) | 80,952,986 | 72,011,324 | 66,931,582 |
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Preferred Shares
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| Preferred shares issued to the public (in shares) and Common shares issued to the public (in shares) | 6,900,000 | ||
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Common Shares
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| Preferred shares issued to the public (in shares) and Common shares issued to the public (in shares) | 8,625,000 | 4,600,000 | 7,475,000 |
| X | ||||||||||
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- Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of new stock issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of stock bought back by the entity at the exercise price or redemption price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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