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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Statement of Financial Position [Abstract]    
Preferred Stock Series D, E, F, G and I, liquidation preference per share (in dollars per share) $ 25 $ 25
Common Stock, par value (in dollars per share) $ 0.001 $ 0.001
Common Stock, shares authorized 200,000 200,000
Common Stock, shares issued 142,699 140,028
Common Stock, shares outstanding 83,782 81,920
Treasury stock, par value (in dollars per share) $ 0.001 $ 0.001
Treasury stock, shares 58,917 58,108