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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
Mar. 31, 2019
Mar. 31, 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) 107 136
Granted, weighted average grant date fair value (in dollars per share) $ 56.04 $ 69.30
Forfeited (in shares) (17) (28)
Forfeited, weighted average grant date fair value (in dollars per share) $ 66.17  
Outstanding, ending balance (in shares) 591 891
Outstanding, ending balance, weighted average grant date fair value (in dollars per share) $ 64.51  
Vested and Released [Member]    
[Line Items]    
Released (in shares) [1] (316) (352)
Released, weighted average grant date fair value (in dollars per share) $ 60.29  
Released, aggregate intrinsic value $ 19,074 $ 17,231
Vested but Not Released [Member]    
[Line Items]    
Released (in shares) (8)  
Released, aggregate intrinsic value $ 361  
Expected to Vest [Member]    
[Line Items]    
Outstanding, ending balance (in shares) 579  
Expected to vest, aggregate intrinsic value $ 27,018  
Long Term Performance Restricted Stock Award [Member]    
[Line Items]    
Expected volatility 31.30% 28.00%
Risk-free interest rate 2.50% 2.20%
Expected term (years) 1 year 7 months 6 days 2 years 1 month 6 days
Granted, weighted average grant date fair value (in dollars per share) $ 60.91 $ 78.56
[1] (1) Shares released is presented gross of shares netted for employee payroll tax obligations.