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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 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)     118 150
Granted, weighted average grant date fair value (in dollars per share)     $ 56.40 $ 67.61
Forfeited (in shares)     (36) (79)
Forfeited, weighted average grant date fair value (in dollars per share)     $ 66.61  
Outstanding, ending balance (in shares) 536 761 536 761
Outstanding, ending balance, weighted average grant date fair value (in dollars per share) $ 63.92   $ 63.92  
Vested and Released [Member]        
[Line Items]        
Released (in shares) [1]     (363) (445)
Released, weighted average grant date fair value (in dollars per share)     $ 61.42  
Released, aggregate intrinsic value     $ 22,304 $ 23,609
Vested but Not Released [Member]        
[Line Items]        
Released (in shares)     (8)  
Released, aggregate intrinsic value     $ 516  
Expected to Vest [Member]        
[Line Items]        
Outstanding, ending balance (in shares) 524   524  
Expected to vest, aggregate intrinsic value $ 32,796   $ 32,796  
Long Term Performance Restricted Stock Award [Member]        
[Line Items]        
Expected volatility 0.00% 0.00% 31.30% 28.00%
Risk-free interest rate 0.00% 0.00% 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) $ 0 $ 0 $ 60.91 $ 78.56
[1]

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