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Stock-Based Compensation (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized stock-based compensation cost $ 9.8   $ 9.8  
Unrecognized stock-based compensation cost, weighted-average period recognized 1 year 6 months 3 days      
Supplemental Incentive Accrual - Change in Period     1.2  
Supplementary Incentive Plan Accrual     1.8  
Annual Incentive Plan and Long Term Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense for stock based compensation awards $ 1.6 $ 2.5 $ 6.4 $ 7.5