XML 23 R74.htm IDEA: XBRL DOCUMENT v3.19.3
Stock-Based Compensation Restricted Stock Units Summary (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
[Line Items]      
Outstanding, beginning balance (in shares)   817 556
Outstanding, beginning balance, weighted average grant date fair value (in dollars per share)   $ 59.70  
Converted upon acquisition (in shares)     579
Granted (in shares)   334 262
Granted, weighted average grant date fair value (in dollars per share)   $ 62.04 $ 65.22
Forfeited (in shares)   (53) (102)
Forfeited, weighted average grant date fair value (in dollars per share)   $ 66.27  
Outstanding, ending balance (in shares) 663 663 801
Outstanding, ending balance, weighted average grant date fair value (in dollars per share) $ 64.30 $ 64.30  
Vested and Released [Member]      
[Line Items]      
Released (in shares) [1]   (435) (494)
Released, weighted average grant date fair value (in dollars per share)   $ 61.79  
Released, aggregate intrinsic value   $ 26,852 $ 26,753
Vested but Not Released [Member]      
[Line Items]      
Released (in shares)   (8)  
Released, aggregate intrinsic value   $ 602  
Expected to Vest [Member]      
[Line Items]      
Outstanding, ending balance (in shares) 652 652  
Expected to vest, aggregate intrinsic value $ 48,190 $ 48,190  
Long Term Performance Restricted Stock Award [Member]      
[Line Items]      
Expected volatility 33.40% 31.40% 28.00%
Risk-free interest rate 1.80% 2.50% 2.20%
Expected term (years) 2 years 6 months 1 year 7 months 6 days 2 years 1 month 6 days
Granted, weighted average grant date fair value (in dollars per share) $ 72.18 $ 61.25 $ 78.56
[1]

(1)     Shares released is presented gross of shares netted for employee payroll tax obligations.