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Equity Based Plans (Details 1) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Summary of stock options granted under the plans        
Number of Shares, Outstanding, Beginning Balance 348,810 723,890 874,192  
Weighted Average Exercise Price, Outstanding, Beginning Balance $ 14.71 $ 14.30 $ 14.24  
Weighted Average Remaining Contractual Term 2 years 2 months 12 days 2 years 7 months 6 days 3 years 7 months 6 days 4 years 7 months 6 days
Number of Shares, Granted 0 0 0  
Weighted Average Exercise Price, Granted         
Stock Options Exercised 3,802,263 375,080 142,002  
Weighted Average Exercise Price, Exercised $ 14.14 $ 13.92 $ 13.66  
Number of Shares, Cancelled (220)    (160)  
Weighted Average Exercise Price, Cancelled $ 17.89   $ 18.42  
Number of Shares, Forfeited       (8,140)  
Weighted Average Exercise Price, Forfeited     $ 18.54  
Number of Shares, Outstanding, Ending Balance 75,840 348,810 723,890 874,192
Weighted Average Exercise Price, Outstanding, Ending Balance    $ 14.71 $ 14.30 $ 14.24
Number of Shares, Exercisable, Ending Balance 75,840 348,810 723,890  
Weighted Average Exercise Price, Exercisable         
Weighted Average Remaining Contractual Term, Exercisable 2 years 2 months 12 days      
Aggregate Intrinsic Value, Exercisable $ 811