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Equity Incentive Plan Textuals (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [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 $ 397.95 $ 312.57  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share $ 8,300,000 8,100,000  
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 $ 118.31 $ 92.81 $ 77.64
Options, Exercises in Period, Total Intrinsic Value $ 69,500 $ 90,700 $ 66,900
Stock Options, Vested in Period, Total Fair Value 7,400 8,600 6,400
Restricted Stock Units, Vested in Period, Total Fair Value 6,300 6,000 $ 5,800
Allocated Share-based Compensation Expense for Restricted Stock Units $ 6,400 $ 5,800  
Number of Shares Available for Grant 2,305,033    
Deferred Compensation Liability, Current and Noncurrent $ 49,800    
Estimated Weighted Average Amortization Period 2 years 4 months 24 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 $ 470,170    
Performance Share Unit Total Grant Value $ 2,100