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Stock Compensation Plans - Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 971,107 | 807,868 |  |
Share based compensation stock option weighted average remaining contractual term | 7 years 2 months 23 days | 7 years 6 months 14 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ 48.079 | $ 49.139 | $ 43.886 | $ 38.860
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 363,695 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ 42.583 |  |  |
Range of Exercise Prices Member | $16.810 to 29.640 Member |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 64,043 |  |  |
Share based compensation stock option weighted average remaining contractual term | 2 years 1 month 28 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ 25.598 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 64,043 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ 25.598 |  |  |
Exercise price range, minimum | 16.810 |  |  |
Exercise price range, maximum | $ 29.640 |  |  |
Range of Exercise Prices Member | $32.590 to 38.610 Member |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 62,056 |  |  |
Share based compensation stock option weighted average remaining contractual term | 3 years 7 months 13 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ 33.001 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 61,181 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ 32.921 |  |  |
Exercise price range, minimum | 32.590 |  |  |
Exercise price range, maximum | $ 38.610 |  |  |
Range of Exercise Prices Member | $41.300 to 47.800 Member |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 282,357 |  |  |
Share based compensation stock option weighted average remaining contractual term | 8 years 6 months 21 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ 41.613 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 59,816 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ 41.335 |  |  |
Exercise price range, minimum | 41.300 |  |  |
Exercise price range, maximum | $ 47.800 |  |  |
Range of Exercise Prices Member | $50.710 to 52.500 Member |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 204,251 |  |  |
Share based compensation stock option weighted average remaining contractual term | 6 years 1 month 9 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ 51.656 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 133,496 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ 51.415 |  |  |
Exercise price range, minimum | 50.710 |  |  |
Exercise price range, maximum | $ 52.500 |  |  |
Range of Exercise Prices Member | $55.000 to 60.150 Member |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 358,400 |  |  |
Share based compensation stock option weighted average remaining contractual term | 8 years 4 months 6 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ 57.762 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 45,159 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ 55.306 |  |  |
Exercise price range, minimum | 55.000 |  |  |
Exercise price range, maximum | $ 60.150 |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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