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Equity Incentive Plan Textuals - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years 6 months    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 1,104.02 $ 720.81 $ 595.31
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share $ 9,100,000 8,900,000 9,600,000
Number of Shares Authorized for Stock Option Plan 2,000,000    
Options, Award Vesting Period 5 years    
Restricted Stock Units, Vesting Period 5 years    
Options, Grants in Period, Weighted Average Grant Date Fair Value $ 284.25 $ 196.40 $ 189.78
Options, Exercises in Period, Total Intrinsic Value $ 84,500 $ 146,600 $ 74,300
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 7,700 8,000 8,400
Restricted Stock Units, Vested in Period, Total Fair Value 7,700 7,000 7,200
Allocated Share-based Compensation Expense for Restricted Stock Units $ 7,900 $ 7,100 $ 6,800
Number of Shares Available for Grant 2,080,274    
Deferred Compensation Liability, Current and Noncurrent $ 48,200    
Estimated Weighted Average Amortization Period 2 years 2 months 12 days    
Performance Share Units Vesting Period 3 years    
Share Based Compensation Arrangements By Share Based Payment Award, Performance Options Grants in Period 12,678    
Performance Options Total Value of Grant $ 1,500    
Performance Share Unit Payout Percentage - Minimum 0.00%    
Performance Share Units Payout Percentage - Maximum 200.00%    
Performance Option Fair Value $ 1,345.03 $ 803.26 $ 733.35
Performance Share Unit Total Grant Value $ 3,600    
Performance Share Payout Percentage 132.00%