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Stock Based Compensation (Details) (Restricted Stock [Member], USD $)
9 Months Ended
Sep. 30, 2012
Restricted Stock [Member]
 
Shares Outstanding,Unvested restricted stock at January 1, 2012 216,920
Shares Outstanding,Restricted stock granted 94,850
Shares Outstanding,Restricted stock vested (55,870)
Shares Outstanding,Restricted stock forfeited (5,720)
Shares Outstanding, Unvested restricted stock at September 30, 2012 250,180
Weighted Average Grant Date Fair Value,Unvested restricted stock at January 1, 2012 $ 21.74
Weighted Average Grant Date Fair Value,Restricted stock granted $ 24.40
Weighted Average Grant Date Fair Value,Restricted stock vested $ 21.87
Weighted Average Grant Date Fair Value,Restricted stock forfeited $ 24.32
Weighted Average Grant Date Fair Value,Unvested restricted stock at September 30, 2012 $ 22.66