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Financial Information of Registrant (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
CONDENSED BALANCE SHEETS    
Cumulative convertible preferred stock, par value $ 0.01 $ 0.01
Cumulative convertible preferred stock, shares authorized 1,000 1,000
Cumulative convertible preferred stock, shares issued 108 108
Cumulative convertible preferred stock, shares outstanding 108 108
Cumulative convertible preferred stock, minimum liquidation preference $ 2.66 $ 2.66
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 55,000 55,000
Common stock, shares issued 41,889 41,100
Common stock, shares outstanding 40,871 40,082
Treasury stock, shares 1,018 1,018
Parent Company [Member]
    
CONDENSED BALANCE SHEETS    
Cumulative convertible preferred stock, par value $ 0.01 $ 0.01
Cumulative convertible preferred stock, shares authorized 1,000 1,000
Cumulative convertible preferred stock, shares issued 108 108
Cumulative convertible preferred stock, shares outstanding 108 108
Cumulative convertible preferred stock, minimum liquidation preference $ 2.66 $ 2.66
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 55,000 55,000
Common stock, shares issued 41,889 41,100
Common stock, shares outstanding 40,871 40,082
Treasury stock, shares 1,018 1,018