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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Statement Of Financial Position [Abstract]    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 2,000 2,000
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 250,000 250,000
Common stock, shares issued 129,410 126,554
Common stock, shares outstanding 127,461 125,272