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Share Based Award Stock Option Activity (Details) - Share-based Payment Arrangement, Option [Member]
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options, Outstanding, Number | shares 1,186,928
Granted | shares 6,265
Exercised | shares (145,339)
Forfeited or expired | shares 0
Options, Outstanding, Number | shares 1,047,854
Exercisable | shares 1,041,589
Vested and Expected to Vest | shares 1,047,854
Options, Outstanding, Weighted Average Exercise Price | $ / shares $ 63.66
Weighted Average Exercise Price | $ / shares 225.27
Options, Exercises in Period, Weighted Average Exercise Price | $ / shares 53.18
Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value | $ / shares 0
Options, Outstanding, Weighted Average Exercise Price | $ / shares 66.08
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price | $ / shares 65.12
Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ / shares $ 66.08
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 4 years 1 month 6 days
Options, Exercisable, Weighted Average Remaining Contractual Term 4 years
Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 4 years 1 month 6 days
Options, Outstanding, Intrinsic Value | $ $ 127,556
Options, Exercisable, Intrinsic Value | $ 127,556
Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | $ $ 127,556