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Stock Award Plans, Director Plan Outstanding and Exercisable Options (Details) - Director Plan [Member] - Stock Options [Member] | 12 Months Ended
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Dec. 31, 2018 USD ($) $ / shares shares
First Price Range [Member] |
Outstanding and Exercisable Stock options [Abstract] |
Range of Exercise Prices, upper limit (in dollars per share) | $ 29.60
Options Outstanding [Abstract] |
Number Outstanding (in shares) | shares | 6,000
Weighted Average Remaining Contractual Life | 3 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) | $ 29.6
Options Exercisable [Abstract] |
Number Exercisable (in shares) | shares | 6,000
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 29.60
Second Price Range [Member] |
Outstanding and Exercisable Stock options [Abstract] |
Range of Exercise Prices, lower limit (in dollars per share) | 41.24
Range of Exercise Prices, upper limit (in dollars per share) | $ 56.45
Options Outstanding [Abstract] |
Number Outstanding (in shares) | shares | 31,276
Weighted Average Remaining Contractual Life | 1 year 10 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) | $ 50.61
Options Exercisable [Abstract] |
Number Exercisable (in shares) | shares | 31,276
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 50.61
Third Price Range [Member] |
Outstanding and Exercisable Stock options [Abstract] |
Range of Exercise Prices, lower limit (in dollars per share) | 61.89
Range of Exercise Prices, upper limit (in dollars per share) | $ 62.48
Options Outstanding [Abstract] |
Number Outstanding (in shares) | shares | 28,000
Weighted Average Remaining Contractual Life | 3 years 7 months 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) | $ 62.27
Options Exercisable [Abstract] |
Number Exercisable (in shares) | shares | 28,000
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 62.27
Fourth Price Range [Member] |
Outstanding and Exercisable Stock options [Abstract] |
Range of Exercise Prices, lower limit (in dollars per share) | 70.65
Range of Exercise Prices, upper limit (in dollars per share) | $ 99.52
Options Outstanding [Abstract] |
Number Outstanding (in shares) | shares | 65,828
Weighted Average Remaining Contractual Life | 5 years 2 months 12 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) | $ 86.45
Options Exercisable [Abstract] |
Number Exercisable (in shares) | shares | 65,168
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 86.47
Full Exercise Price Range [Member] |
Outstanding and Exercisable Stock options [Abstract] |
Range of Exercise Prices, lower limit (in dollars per share) | 29.60
Range of Exercise Prices, upper limit (in dollars per share) | $ 99.52
Options Outstanding [Abstract] |
Number Outstanding (in shares) | shares | 131,104
Weighted Average Remaining Contractual Life | 3 years 9 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) | $ 70.14
Aggregate Intrinsic Value, Options Outstanding | $ | $ 893,000
Options Exercisable [Abstract] |
Number Exercisable (in shares) | shares | 130,444
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 70.06
Aggregate Intrinsic Value, Options Exercisable | $ | $ 893,000

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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 + 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 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=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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)-(ii) -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 Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 + 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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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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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