XML 76 R62.htm IDEA: XBRL DOCUMENT v3.8.0.1
Equity Incentive Plan Textuals (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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 $ 671.60 $ 397.95  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share $ 8,700,000 8,300,000  
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 $ 206.56 $ 118.31 $ 92.81
Options, Exercises in Period, Total Intrinsic Value $ 105,600 $ 69,500 $ 90,700
Stock Options, Vested in Period, Total Fair Value 8,300 7,400 8,600
Restricted Stock Units, Vested in Period, Total Fair Value 6,800 6,300 $ 6,000
Allocated Share-based Compensation Expense for Restricted Stock Units $ 6,500 $ 6,400  
Number of Shares Available for Grant 2,230,063    
Deferred Compensation Liability, Current and Noncurrent $ 53,000    
Estimated Weighted Average Amortization Period 2 years 3 months 18 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