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Stock-Based Compensation - Performance Share Units (Details) - Performance share units - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Mar. 31, 2016
Sep. 30, 2014
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vested (in shares)     18,685  
Weighted average remaining recognition period of unrecognized stock-based compensation costs (in years)     1 year 10 months 24 days  
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation costs related to unvested options     $ 8.7  
Performance-Based Incentive Program        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Forfeited (in shares)     4,493 0
Executive Management        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock unit granted to an executive (in shares) 94,780      
Executive Management | Performance-Based Incentive Program        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance period to earn vested common stock   3 years