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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Series A Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Series A Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Series A Preferred stock, shares issued (in shares) 80,696 80,718
Series A Preferred stock, shares outstanding (in shares) 80,696 80,718
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 195,000,000 195,000,000
Common stock, shares issued (in shares) 93,236,177 93,230,848
Common stock, shares outstanding (in shares) 88,449,656 88,844,327