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Consolidated Statements of Changes In Equity (USD $) | Total | Common Stock | Additional Paid-in Capital | Cumulative Series C Six Point Seven Five Percent Redeemable Perpetual Preferred Stock [Member] | Distributions in Excess of Accumulated Earnings | Non-controlling interests - Common OP Units | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2012 | $ 924,302,000 | $ 832,000 | $ 1,012,514,000 | $ 136,144,000 | $ (287,652,000) | $ 65,054,000 | $ (2,590,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock through exercise of options | 248,000 | 1,000 | 247,000 | 0 | 0 | 0 | 0
Issuance of common stock through employee stock purchase plan | 330,000 | 1,000 | 329,000 | 0 | 0 | 0 | 0
Compensation expenses related to stock options and restricted stock | 2,716,000 | 0 | 2,716,000 | 0 | 0 | 0 | 0
Adjustment for fair market value of swap | 872,000 | 0 | 0 | 0 | 0 | 0 | 872,000
Release Of Common Shares From Escrow | (1,157,000) | 0 | (1,157,000) | 0 | 0 | 0 | 0
Net income available to Common Shares | 62,253,000 | 0 | 0 | 4,640,000 | 52,883,000 | 4,730,000 | 0
Distributions | (50,047,000) | 0 | 0 | (4,640,000) | (41,679,000) | (3,728,000) | 0
Other | (479,000) | 0 | (479,000) | 0 | 0 | 0 | 0
Ending Balance at Jun. 30, 2013 | $ 939,038,000 | $ 834,000 | $ 1,014,170,000 | $ 136,144,000 | $ (276,448,000) | $ 66,056,000 | $ (1,718,000)

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