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Equity-Based Compensation Plans Equity-Based Compensation Plans (Details 4) (Restricted Stock [Member], USD $)
9 Months Ended
Sep. 30, 2013
Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Beginning Balance 364,650
Weighted Average Exercise Price, Beginning Balance $ 25.25
Number of Restricted Shares, Granted 338,300
Weighted Average Exercise Price, Granted $ 11.37
Number of Restricted Shares, Exercised (39,750)
Weighted Average Exercise Price, Exercised $ 26.06
Number of Restricted Shares, Cancelled (10,000)
Weighted Average Exercise Price, Cancelled $ 16.58
Number of Share Units, Ending Balance 653,200
Weighted Average Exercise Price, Ending Balance $ 18.15
Aggregate Intrinsic Value, Ending Balance $ 7,864,528