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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Common Stock, par value (in dollars per share) $ 0.001 $ 0.001
Common Stock, shares authorized 200,000 200,000
Common Stock, shares issued 143,969 142,699
Common Stock, shares outstanding 85,052 83,782
Treasury stock, par value (in dollars per share) $ 0.001 $ 0.001
Treasury stock, shares 58,917 58,917
Series J Preferred Stock
    
Preferred Stock Series, liquidation preference per share (in dollars per share) $ 50 $ 0
Series D, E, F, G and I Preferred Stock [Member]
    
Preferred Stock Series, liquidation preference per share (in dollars per share) $ 25 $ 25