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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 | Accumulated Other Comprehensive Loss | Retained Earnings | Total Common Shareholders’ Equity | Noncontrolling Interests
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2009 | $ 532,477 | $ 40 | $ 299,014 | $ (2,994) | $ 16,125 | $ 312,185 | $ 220,292
Balance (in Shares) at Dec. 31, 2009 |  | 39,787,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership |  |  | 3,240 |  |  | 3,240 | (3,240)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares) |  | 365,000 |  |  |  |  |
Issuance of OP Units to acquire real estate | 0 |  |  |  |  |  |
Vesting of employee Restricted Share and LTIP awards | 3,838 |  | 2,060 |  |  | 2,060 | 1,778
Vesting of employee Restricted Share and LTIP awards (in Shares) |  | 133,000 |  |  |  |  |
Dividends declared | (29,699) |  |  |  | (28,976) | (28,976) | (723)
Exercise of options | 109 |  | 109 |  |  | 109 | 0
Exercise of options (in Shares) |  | 7,000 |  |  |  |  |
Common Shares issued under Employee Share Purchase Plan | 100 | 0 | 100 | 0 | 0 | 100 | 0
Common Shares issued under Employee Share Purchase Plan (in Shares) |  | 6,184 |  |  |  |  |
Issuance of Common Shares to Trustees | 266 |  | 266 |  |  | 266 |
Issuance of Common Shares to Trustees (in Shares) |  | 13,000 |  |  |  |  |
Employee Restricted Shares canceled | (966) |  | (966) |  |  | (966) |
Employee Restricted Shares cancelled (in Shares) |  | (57,000) |  |  |  |  |
Noncontrolling interest distributions | (2,892) |  |  |  |  |  | (2,892)
Noncontrolling interest contributions | 33,556 |  |  |  |  |  | 33,556
Balance before adjustment toward comprehensive income | 536,789 | 40 | 303,823 | (2,994) | (12,851) | 288,018 | 248,771
Balance before adjustment toward comprehensive income (in Shares) |  | 40,254,000 |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |
Net income | 50,667 |  |  |  | 30,057 | 30,057 | 20,610
Unrealized loss on valuation of swap agreements | (2,683) |  |  | (2,329) | 0 | (2,329) | (354)
Reclassification of realized interest on swap agreements | 2,749 |  |  | 2,466 | 0 | 2,466 | 283
Total comprehensive income | 50,733 |  |  | 137 | 30,057 | 30,194 | 20,539
Balance at Dec. 31, 2010 | 587,522 | 40 | 303,823 | (2,857) | 17,206 | 318,212 | 269,310
Balance (in Shares) at Dec. 31, 2010 |  | 40,254,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership |  |  | 56 |  |  | 56 | (56)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares) |  | 11,000 |  |  |  |  |
Issuance of Common Shares, net of issuance costs | 44,660 | 2 | 44,658 |  |  | 44,660 |
Issuance of Common Shares, net of issuance costs (in Shares) |  | 2,250,000 |  |  |  |  |
Issuance of OP Units to acquire real estate | 0 |  |  |  |  |  |
Vesting of employee Restricted Share and LTIP awards | 4,032 | 1 | 481 |  |  | 482 | 3,550
Vesting of employee Restricted Share and LTIP awards (in Shares) |  | 96,000 |  |  |  |  |
Dividends declared | (30,428) |  |  |  | (29,444) | (29,444) | (984)
Exercise of options | 16 |  | 16 |  |  | 16 |
Exercise of options (in Shares) |  | 2,000 |  |  |  |  |
Common Shares issued under Employee Share Purchase Plan | 93 |  | 93 |  |  | 93 |
Common Shares issued under Employee Share Purchase Plan (in Shares) |  | 4,886 |  |  |  |  |
Issuance of LTIP Unit awards to employees | 2,441 |  |  |  |  |  | 2,441
Issuance of Common Shares to Trustees | 264 |  | 264 |  |  | 264 |
Issuance of Common Shares to Trustees (in Shares) |  | 8,000 |  |  |  |  |
Employee Restricted Shares canceled | (724) |  | (724) |  |  | (724) |
Employee Restricted Shares cancelled (in Shares) |  | (40,000) |  |  |  |  |
Noncontrolling interest distributions | (7,697) |  |  |  |  |  | (7,697)
Noncontrolling interest contributions | 117,945 |  |  |  |  |  | 117,945
Balance before adjustment toward comprehensive income | 718,124 | 43 | 348,667 | (2,857) | (12,238) | 333,615 | 384,509
Balance before adjustment toward comprehensive income (in Shares) |  | 42,586,000 |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |
Net income | 53,715 |  |  |  | 51,555 | 51,555 | 2,160
Unrealized loss on valuation of swap agreements | (5,611) |  |  | (3,461) |  | (3,461) | (2,150)
Reclassification of realized interest on swap agreements | 3,081 |  |  | 2,405 |  | 2,405 | 676
Total comprehensive income | 51,185 |  |  | (1,056) | 51,555 | 50,499 | 686
Balance at Dec. 31, 2011 | 769,309 | 43 | 348,667 | (3,913) | 39,317 | 384,114 | 385,195
Balance (in Shares) at Dec. 31, 2011 | 42,586,376 | 42,586,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership |  |  | 5,880 |  |  | 5,880 | (5,880)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares) |  | 334,000 |  |  |  |  |
Issuance of Common Shares, net of issuance costs | 226,721 | 9 | 226,712 |  |  | 226,721 |
Issuance of Common Shares, net of issuance costs (in Shares) |  | 9,510,000 |  |  |  |  |
Issuance of OP Units to acquire real estate | 2,279 |  |  |  |  |  | 2,279
Vesting of employee Restricted Share and LTIP awards | 3,640 |  | 192 |  |  | 192 | 3,448
Vesting of employee Restricted Share and LTIP awards (in Shares) |  | 44,000 |  |  |  |  |
Dividends declared | (34,994) |  |  |  | (33,896) | (33,896) | (1,098)
Exercise of options | 187 |  | 187 |  |  | 187 |
Exercise of options (in Shares) |  | 12,636 |  |  |  |  |
Common Shares issued under Employee Share Purchase Plan | 75 |  | 75 |  |  | 75 |
Common Shares issued under Employee Share Purchase Plan (in Shares) |  | 3,829 |  |  |  |  |
Issuance of LTIP Unit awards to employees | 2,577 |  |  |  |  |  | 2,577
Issuance of Common Shares to Trustees | 384 |  | 384 |  |  | 384 |
Issuance of Common Shares to Trustees (in Shares) |  | 0 |  |  |  |  |
Employee Restricted Shares canceled | (172) |  | (172) |  |  | (172) |
Employee Restricted Shares cancelled (in Shares) |  | (9,000) |  |  |  |  |
Noncontrolling interest distributions | (160,663) |  |  |  |  |  | (160,663)
Noncontrolling interest contributions | 172,228 |  |  |  |  |  | 172,228
Balance before adjustment toward comprehensive income | 981,571 | 52 | 581,925 | (3,913) | 5,421 | 583,485 | 398,086
Balance before adjustment toward comprehensive income (in Shares) |  | 52,482,000 |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |
Net income | 89,936 |  |  |  | 39,706 | 39,706 | 50,230
Unrealized loss on valuation of swap agreements | (3,519) |  |  | (1,815) |  | (1,815) | (1,704)
Reclassification of realized interest on swap agreements | 2,268 |  |  | 1,421 |  | 1,421 | 847
Total comprehensive income | 88,685 |  |  | (394) | 39,706 | 39,312 | 49,373
Balance at Dec. 31, 2012 | $ 1,070,256 | $ 52 | $ 581,925 | $ (4,307) | $ 45,127 | $ 622,797 | $ 447,459
Balance (in Shares) at Dec. 31, 2012 | 52,482,598 | 52,482,000 |  |  |  |  |

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