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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, 2013 | $ 963,205,000 | $ 834,000 | $ 1,021,365,000 | $ 136,144,000 | $ (264,083,000) | $ 69,872,000 | $ (927,000)
Stock Issued During Period, Value, Conversion of Units | 0 | (4,000) | (4,085,000) | 0 | 0 | (4,089,000) | 0
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | (154,000) | 0 | (154,000) | 0 | 0 | 0 | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock through employee stock purchase plan | 929,000 | 1,000 | 928,000 | 0 | 0 | 0 | 0
Compensation expenses related to stock options and restricted stock | 4,998,000 | 0 | 4,998,000 | 0 | 0 | 0 | 0
Stock Repurchased During Period, Value | (32,000) | 0 | (32,000) | 0 | 0 | 0 | 0
Adjustment for fair market value of swap | 1,068,000 | 0 | 0 | 0 | 0 | 0 | 1,068,000
Release Of Common Shares From Escrow | (1,934,000) | (1,000) | (1,933,000) | 0 | 0 | 0 | 0
Adjustment For Common Unitholders In Operating Partnership | 0 | 0 | (345,000) | 0 | 0 | 345,000 | 0
Net income available to Common Shares | 104,206,000 | 0 | 0 | 6,949,000 | 89,328,000 | 7,929,000 | 0
Distributions | (95,742,000) | 0 | 0 | (6,949,000) | (81,585,000) | (7,208,000) | 0
Ending Balance at Sep. 30, 2014 | $ 976,544,000 | $ 838,000 | $ 1,028,912,000 | $ 136,144,000 | $ (256,340,000) | $ 66,849,000 | $ 141,000

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