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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Jun. 30, 2013
Dec. 31, 2012
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) 80,084 80,283
Series A Preferred stock, shares outstanding (in shares) 80,084 80,283
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) 93,389,230 93,335,158
Common stock, shares outstanding (in shares) 88,602,709 88,548,637