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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, 2020
Dec. 31, 2019
Dec. 31, 2018
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) 684 817 556
Converted upon acquisition (in shares)     579
Granted (in shares) 262 404 387
Forfeited (in shares) (39) (66) (112)
Outstanding, ending balance (in shares) 544 684 817
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) $ 64.38 $ 59.70 $ 47.68
Shares converted upon acquisition (in dollars per share)     69.40
Granted (in dollars per share) 83.42 62.97 57.48
Forfeitures (in dollars per share) 71.96    
Outstanding, ending balance (in dollars per share) $ 71.79 $ 64.38 $ 59.70
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) (363) (471) (593)
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) $ 65.25    
Released, Aggregate Intrinsic Value $ 23,702 $ 29,304 $ 32,567
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) (50)    
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 $ 4,836