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Share-Based Compensation - Information pertaining to options outstanding (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share Based Compensation |  |  |
Range of exercise prices, low end of range (in dollars per share) | $ 87.30 | $ 87.30 | $ 69.48
Range of exercise prices, high end of range (in dollars per share) | $ 91.35 | $ 91.35 | $ 91.35
Options Outstanding |  |  |
Number outstanding (in shares) | 176,888 |  |
Weighted Average Remaining Contractual Life | 5 years 4 months 24 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 67.14 |  |
Options Exercisable |  |  |
Number outstanding (in shares) | 131,216 |  |
Weighted Average Exercise Price (in dollars per share) | $ 60.12 |  |
Weighted Average Remaining Contractual Life | 4 years 7 months 6 days |  |
Restricted Stock |  |  |
Vesting schedule of shares |  |  |
2020 | 48,830 |  |
2021 | 3,905 |  |
2022 | 4,174 |  |
2023 | 4,553 |  |
2024 | 3,405 |  |
Thereafter | 4,583 |  |
$26.01 - $ 40.00 |  |  |
Share Based Compensation |  |  |
Range of exercise prices, low end of range (in dollars per share) | $ 26.01 |  |
Range of exercise prices, high end of range (in dollars per share) | $ 40.00 |  |
Options Outstanding |  |  |
Number outstanding (in shares) | 20,170 |  |
Weighted Average Remaining Contractual Life | 1 year 8 months 12 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 31.56 |  |
Options Exercisable |  |  |
Number outstanding (in shares) | 20,164 |  |
Weighted Average Exercise Price (in dollars per share) | $ 31.56 |  |
$40.01 - $ 55.00 |  |  |
Share Based Compensation |  |  |
Range of exercise prices, low end of range (in dollars per share) | 40.01 |  |
Range of exercise prices, high end of range (in dollars per share) | $ 55.00 |  |
Options Outstanding |  |  |
Number outstanding (in shares) | 19,874 |  |
Weighted Average Remaining Contractual Life | 2 years 10 months 24 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 41.42 |  |
Options Exercisable |  |  |
Number outstanding (in shares) | 19,874 |  |
Weighted Average Exercise Price (in dollars per share) | $ 41.42 |  |
$55.01 - $ 70.00 |  |  |
Share Based Compensation |  |  |
Range of exercise prices, low end of range (in dollars per share) | 55.01 |  |
Range of exercise prices, high end of range (in dollars per share) | $ 70.00 |  |
Options Outstanding |  |  |
Number outstanding (in shares) | 74,609 |  |
Weighted Average Remaining Contractual Life | 5 years 1 month 6 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 63.61 |  |
Options Exercisable |  |  |
Number outstanding (in shares) | 68,186 |  |
Weighted Average Exercise Price (in dollars per share) | $ 63.59 |  |
$70.01 - $ 85.00 |  |  |
Share Based Compensation |  |  |
Range of exercise prices, low end of range (in dollars per share) | 70.01 |  |
Range of exercise prices, high end of range (in dollars per share) | 85.00 |  |
$85.01 - $ 91.35 |  |  |
Share Based Compensation |  |  |
Range of exercise prices, low end of range (in dollars per share) | 85.01 |  |
Range of exercise prices, high end of range (in dollars per share) | $ 91.35 |  |
Options Outstanding |  |  |
Number outstanding (in shares) | 62,235 |  |
Weighted Average Remaining Contractual Life | 7 years 7 months 6 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 91.12 |  |
Options Exercisable |  |  |
Number outstanding (in shares) | 22,992 |  |
Weighted Average Exercise Price (in dollars per share) | $ 91.07 |  |

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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=116856206&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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