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Stock-based Compensation - Additional Disclosures (Details)
$ in Millions
6 Months Ended
Jun. 30, 2016
USD ($)
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized pre-tax stock-based compensation expense $ 5.2
Unrecognized pre-tax stock-based compensation expense, period for recognition 2 years 3 months 18 days
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized pre-tax stock-based compensation expense $ 8.9
Unrecognized pre-tax stock-based compensation expense, period for recognition 2 years