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Consolidated Balance Sheets (Parenthetical) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Common Stock, par value (in dollars per share) $ 0.001 $ 0.001
Common Stock, shares authorized 200,000,000 200,000,000
Common Stock, shares issued 144,319,000 142,699,000
Common Stock, shares outstanding 85,402,000 83,782,000
Treasury stock, par value (in dollars per share) $ 0.001 $ 0.001
Treasury stock, shares 58,917,000 58,917,000
Preferred Stock Series D, E, F, G and I
    
Preferred Stock Series, liquidation preference per share (in dollars per share) $ 25 $ 25
Preferred Stock Series J
    
Preferred Stock Series, liquidation preference per share (in dollars per share) $ 50 $ 0