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Equity Based Plans (Details 4) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
Range of Exercise Price One [Member]
Dec. 31, 2012
Range of Exercise Price Two [Member]
Dec. 31, 2012
Range of Exercise Price Three [Member]
Dec. 31, 2012
Range of Exercise Price Four [Member]
Stock options outstanding and exercisable                
Exercise price, Lower Range Limit         $ 12.00 $ 14.00 $ 15.00 $ 18.00
Exercise price, Upper Range Limit         $ 12.99 $ 14.99 $ 15.99 $ 18.80
Outstanding stock options 75,840 348,810 723,890 874,192 11,790 2,500 12,550 49,000
Exercisable Options 75,840 348,810 723,890   11,790 2,500 12,550 49,000