XML 83 R72.htm IDEA: XBRL DOCUMENT v3.10.0.1
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, 2017
Sep. 30, 2018
Sep. 30, 2017
[Line Items]      
Outstanding, beginning balance (in shares)   556 701
Outstanding, beginning balance, weighted average grant date fair value (in dollars per share)   $ 47.68  
Converted upon acquisition (in shares)   579  
Converted upon acquisition, weighted average grant date fair value (in dollars per share)   $ 69.40  
Granted (in shares)   262 141
Granted, weighted average grant date fair value (in dollars per share)   $ 65.22 $ 65.54
Forfeited (in shares)   (102) (23)
Forfeited, weighted average grant date fair value (in dollars per share)   $ 68.15  
Outstanding, ending balance (in shares) 479 801 479
Outstanding, ending balance, weighted average grant date fair value (in dollars per share)   $ 62.57  
Vested and Released [Member]      
[Line Items]      
Released (in shares)   (494) (340)
Released, weighted average grant date fair value (in dollars per share)   $ 54.08  
Released, aggregate intrinsic value   $ 26,753 $ 13,097
Vested but Not Released [Member]      
[Line Items]      
Released (in shares)   (9)  
Released, aggregate intrinsic value   $ 586  
Expected to Vest [Member]      
[Line Items]      
Outstanding, ending balance (in shares)   741  
Expected to vest, aggregate intrinsic value   $ 47,554  
Long Term Performance Restricted Stock Award [Member]      
[Line Items]      
Expected volatility 27.90% 28.00% 28.00%
Risk-free interest rate 1.40% 2.20% 1.00%
Expected term (years) 2 years 3 months 18 days 2 years 1 month 6 days 1 year 8 months 12 days
Granted, weighted average grant date fair value (in dollars per share) $ 80.64 $ 78.56 $ 77.75