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Stock-Based Compensation - Performance Share Awards (Details) - Performance Shares Awards - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award requisite performance period 3 years  
Period for share issuance after vesting 60 days  
Expected dividend yield (percent) 0.00% 0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Outstanding (in shares) 142,570  
Granted (in shares) 36,955  
Vested (in shares) (92,747)  
Forfeited (in shares) 0  
Outstanding (in shares) 86,778 142,570
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Outstanding, weighted-average grant date fair value (in dollars per share) $ 39.67  
Granted, weighted-average grant date fair value (in dollars per share) 50.07  
Vested, weighted-average grant date fair value (in dollars per share) 43.64  
Forfeited, weighted-average grant date fair value (in dollars per share) 0.00  
Outstanding, weighted-average grant date fair value (in dollars per share) $ 66.44 $ 39.67
Total compensation cost not yet recognized $ 2.9 $ 4.5
Total compensation cost not yet recognized, period for recognition 1 year 6 months 4 days 1 year 7 months 20 days
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Potential vesting percentage 0.00%  
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Potential vesting percentage 200.00%