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Stock-Based Compensation (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized stock-based compensation cost $ 9.5   $ 9.5  
Unrecognized stock-based compensation cost, weighted-average period recognized     1 year 6 months 7 days  
Supplemental Incentive Accrual - Change in Period     $ 0.4  
Supplementary Incentive Plan Accrual     1.6  
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 $ 2.3 $ 2.6 $ 5.2 $ 4.8