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Consolidated Balance Sheets (Parenthetical) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Preferred stock, shares par value $ 0.01 $ 0.01
Preferred stock, shares authorized 12,500,000 12,500,000
Common stock, shares par value $ 0.06 $ 0.06
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares issued 71,823,000 67,928,000
Common stock, shares outstanding 71,823,000 67,928,000
Treasury stock, shares 3,704,000 1,313,000
Series A [Member]
    
Liquidation preference, per share $ 25.00 $ 25.00
Preferred stock, shares authorized 6,400,000 6,400,000
Preferred stock, shares issued 6,020,000 6,400,000
Preferred stock, shares outstanding 6,020,000 6,400,000
Series B [Member]
    
Liquidation preference, per share $ 25.00 $ 25.00
Preferred stock, shares authorized 5,400,000 5,400,000
Preferred stock, shares issued 453,000 0
Preferred stock, shares outstanding 453,000 0