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Consolidated Statements of Changes In Equity (USD $) In Thousands, unless otherwise specified | 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 | $ 416 | $ 1,012,930 | $ 136,144 | $ (287,652) | $ 65,054 | $ (2,590)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock through exercise of options | 246 | 0 | 246 | 0 | 0 | 0 | 0
Issuance of common stock through employee stock purchase plan | 170 | 0 | 170 | 0 | 0 | 0 | 0
Compensation expenses related to stock options and restricted stock | 1,135 | 0 | 1,135 | 0 | 0 | 0 | 0
Adjustment for fair market value of swap | 442 | 0 | 0 | 0 | 0 | 0 | 442
Net income available to Common Shares | 40,468 | 0 | 0 | 2,311 | 35,024 | 3,133 | 0
Distributions | (25,012) | 0 | 0 | (2,311) | (20,837) | (1,864) | 0
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | (277) | 0 | (277) | 0 | 0 | 0 | 0
Ending Balance at Mar. 31, 2013 | $ 941,474 | $ 416 | $ 1,014,204 | $ 136,144 | $ (273,465) | $ 66,323 | $ (2,148)

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