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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, 2020
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options, Outstanding, Number | shares 1,047,854
Granted | shares 7,190
Exercised | shares (237,244)
Forfeited or expired | shares 0
Options, Outstanding, Number | shares 817,800
Exercisable | shares 810,616
Vested and Expected to Vest | shares 817,800
Options, Outstanding, Weighted Average Exercise Price | $ / shares $ 66.08
Weighted Average Exercise Price | $ / shares 181.99
Options, Exercises in Period, Weighted Average Exercise Price | $ / shares 55.60
Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value | $ / shares 0
Options, Outstanding, Weighted Average Exercise Price | $ / shares 70.13
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price | $ / shares 69.14
Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ / shares $ 70.13
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 3 years 3 months 18 days
Options, Exercisable, Weighted Average Remaining Contractual Term 3 years 3 months 18 days
Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 3 years 3 months 18 days
Options, Outstanding, Intrinsic Value | $ $ 118,444
Options, Exercisable, Intrinsic Value | $ 118,210
Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | $ $ 118,444