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Stock Plans and Stock Based Compensation - Options and SARs Outstanding and Exercisable (Details) | 12 Months Ended
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Dec. 31, 2018 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Outstanding (in shares) | shares | 225,375
Weighted average remaining contractual life (in years) | 4 years 6 months 23 days
Weighted average exercise price (in dollars per share) | $ 48.02
Number exercisable (in shares) | shares | 139,483
Weighted average exercise price (in dollars per share) | $ 44.06
$35.71-37.50 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise prices, lower range (in dollars per share) | 35.71
Range of exercise prices, upper range (in dollars per share) | $ 37.5
Outstanding (in shares) | shares | 42,598
Weighted average remaining contractual life (in years) | 2 years 7 months 12 days
Weighted average exercise price (in dollars per share) | $ 37.00
Number exercisable (in shares) | shares | 42,598
Weighted average exercise price (in dollars per share) | $ 37.00
$37.51-41.00 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise prices, lower range (in dollars per share) | 37.51
Range of exercise prices, upper range (in dollars per share) | $ 41
Outstanding (in shares) | shares | 33,623
Weighted average remaining contractual life (in years) | 4 years 3 months 9 days
Weighted average exercise price (in dollars per share) | $ 40.60
Number exercisable (in shares) | shares | 19,444
Weighted average exercise price (in dollars per share) | $ 40.60
$41.01-50.00 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise prices, lower range (in dollars per share) | 41.01
Range of exercise prices, upper range (in dollars per share) | $ 50
Outstanding (in shares) | shares | 90,478
Weighted average remaining contractual life (in years) | 3 years 11 months 6 days
Weighted average exercise price (in dollars per share) | $ 46.43
Number exercisable (in shares) | shares | 59,900
Weighted average exercise price (in dollars per share) | $ 45.01
$50.01-76.90 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise prices, lower range (in dollars per share) | 50.01
Range of exercise prices, upper range (in dollars per share) | $ 76.9
Outstanding (in shares) | shares | 58,454
Weighted average remaining contractual life (in years) | 7 years 1 month 6 days
Weighted average exercise price (in dollars per share) | $ 62.64
Number exercisable (in shares) | shares | 17,485
Weighted average exercise price (in dollars per share) | $ 61.75
$76.91-86.18 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise prices, lower range (in dollars per share) | 76.91
Range of exercise prices, upper range (in dollars per share) | $ 86.18
Outstanding (in shares) | shares | 222
Weighted average remaining contractual life (in years) | 7 years 10 months 22 days
Weighted average exercise price (in dollars per share) | $ 86.18
Number exercisable (in shares) | shares | 56
Weighted average exercise price (in dollars per share) | $ 86.18

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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=109197908&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=109197908&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=109197908&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=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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