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Equity-Based Compensation Plans (Details 2) (Performance Shares [Member], USD $)
12 Months Ended
Dec. 31, 2012
Performance Shares [Member]
 
Summary of performance share unit  
Number of Restricted Shares, Beginning balance 125,800
Weighted Average Exercise Price, Beginning balance $ 26.33
Number of Performance Share Units, Granted 0
Weighted Average Exercise Price, Granted $ 0
Number of Performance Share Units, Vested 0
Weighted Average Exercise Price, Vested $ 0
Number of Performance Share Units, Cancelled (5,400)
Weighted Average Exercise Price, Cancelled $ 26.80
Number of Performance Share Units, Ending balance 120,400
Weighted Average Exercise Price, Ending balance $ 26.31