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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
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance (in shares) 817 556 701
Converted upon acquisition (in shares)   579  
Granted (in shares) 404 387 273
Forfeited (in shares) (66) (112) (46)
Outstanding, ending balance (in shares) 684 817 556
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Outstanding, beginning balance (in dollars per share) $ 59.70 $ 47.68  
Shares converted upon acquisition (in dollars per share)   69.40  
Granted (in dollars per share) 62.97 57.48 $ 50.95
Forfeitures (in dollars per share) 66.12  
Outstanding, ending balance (in dollars per share) $ 64.38 $ 59.70 $ 47.68
Vested and Released [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Issued (in shares) (471) (593) (372)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Released (in dollars per share) $ 62.28  
Released, Aggregate Intrinsic Value $ 29,304 $ 32,567 $ 14,219
Vested but Not Released [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Issued (in shares) (72)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Released, Aggregate Intrinsic Value $ 6,037