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Stock-Based Plans - Narrative (Details) - Executives - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Restricted stock units      
Stock-Based Plans      
Granted (in shares)   1,065,139 603,111
Granted, weighted average grant date fair value (in dollars per share)   $ 36.45 $ 57.88
Post-vest holding period ( in years ) 3 years 3 years  
Vesting period ( in years ) 3 years    
Stock Options      
Stock-Based Plans      
Options awarded (in shares)   392,841 33,615
Options awarded, weighted average exercise price (in dollars per share)   $ 29.03 $ 58.15
Vesting period ( in years ) 3 years 3 years  
Term of stock-based award ( in years ) 10 years 10 years  
Stock-based VDI units      
Stock-Based Plans      
Granted (in shares)   350,532 206,598
Vesting period ( in years ) 3 years 3 years  
Stock-based VDI units | 2016 VDI Plan      
Stock-Based Plans      
Post-vest holding period ( in years )   3 years  
Expected amount of shares granted (in shares)   83,068  
Expected weighted average grant date fair value (in dollars per share)   $ 35.18  
Stock-based VDI units | 2017 VDI Plan      
Stock-Based Plans      
Post-vest holding period ( in years )   3 years  
Expected amount of shares granted (in shares)   68,866  
Expected weighted average grant date fair value (in dollars per share)   $ 42.24  
Stock-based VDI units | 2018 VDI Plan      
Stock-Based Plans      
Expected amount of shares granted (in shares)   116,844  
Expected weighted average grant date fair value (in dollars per share)   $ 39.72