Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Narrative) (Details)

v3.19.2
Stock-Based Compensation (Narrative) (Details)
6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Employee Stock Options [Member]  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Stock options granted (in shares) | shares 388,517
Unrecognized costs related to share based compensation | $ $ 13,100,000
Weighted average period of recognition of unrecognized costs related to stock options, years 2 years 7 months 17 days
Equity Option [Member]  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 22.58
Restricted Stock Units [Member]  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 95.47
Unrecognized costs related to share based compensation | $ $ 24,700,000
Weighted average period of recognition of unrecognized costs related to stock options, years 2 years 6 months 14 days
Restricted stock units granted (in shares) | shares 167,736