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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Shares | Additional Paid-in Capital | Cumulative Net Income | Cumulative Distributions | Unrealized Gain (Loss) on Investments
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2009 | $ 1,900,650 | $ 1,273 | $ 2,226,474 | $ 640,033 | $ (969,111) | $ 1,981
Balance (in shares) at Dec. 31, 2009 |  | 127,377,665 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Comprehensive income | 128,040 |  |  | 116,485 |  | 11,555
Distributions | (184,757) |  |  |  | (184,757) |
Issuance of shares | 281,986 | 144 | 281,842 |  |  |
Issuance of shares (in shares) |  | 14,375,000 |  |  |  |
Share grants | 2,058 | 1 | 2,057 |  |  |
Share grants (in shares) |  | 101,992 |  |  |  |
Balance at Dec. 31, 2010 | 2,127,977 | 1,418 | 2,510,373 | 756,518 | (1,153,868) | 13,536
Balance (in shares) at Dec. 31, 2010 |  | 141,854,657 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Comprehensive income | 134,111 |  |  | 151,419 |  | (17,308)
Distributions | (223,529) |  |  |  | (223,529) |
Issuance of shares | 432,233 | 207 | 432,026 |  |  |
Issuance of shares (in shares) |  | 20,700,000 |  |  |  |
Share grants | 1,814 | 1 | 1,813 |  |  |
Share grants (in shares) |  | 91,389 |  |  |  |
Balance at Dec. 31, 2011 | 2,472,606 | 1,626 | 2,944,212 | 907,937 | (1,377,397) | (3,772)
Balance (in shares) at Dec. 31, 2011 | 162,646,046 | 162,646,046 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Comprehensive income | 144,218 |  |  | 135,884 |  | 8,334
Distributions | (259,537) |  |  |  | (259,537) |
Issuance of shares | 287,052 | 138 | 286,914 |  |  |
Issuance of shares (in shares) |  | 13,800,000 |  |  |  |
Share grants | 2,229 | 1 | 2,228 |  |  |
Share grants (in shares) |  | 107,554 |  |  |  |
Balance at Dec. 31, 2012 | $ 2,646,568 | $ 1,765 | $ 3,233,354 | $ 1,043,821 | $ (1,636,934) | $ 4,562
Balance (in shares) at Dec. 31, 2012 | 176,553,600 | 176,553,600 |  |  |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 30 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=16317811 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e557-108580 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A5 -Appendix A + Details
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