Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Narrative (Details)

v3.19.2
Stockholders' Equity - Narrative (Details)
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding options that are exercisable (shares) 1,300,000
Outstanding options that are exercisable, weighted average exercise price (USD per share) | $ / shares $ 55.57
Employee Stock Purchase Plan  
Employee Stock Purchase Plan  
Share purchase price as percent of market price (as a percent) 85.00%
Shares available for future purchases (shares) 60,642