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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Cumulative Repurchasing Activity by Plan | The following table summarizes by plan the Company’s repurchasing activity:
|  | Cumulative shares repurchased |  | Average price per share
Non-Discretionary Plan (1994 through 2018) |  | 39,912 |  |  | $ | 35.20 |
Discretionary Plan (2001 through 2018) |  | 68,743 |  |  | $ | 44.66 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | The following table summarizes information about RSU:
|  | Number of shares |  | Weighted average grant date fair value
Outstanding at December 31, 2017 |  | 581 |  |  | $ | 54.11 |
RSU granted |  | 466 |  |  | $ | 69.58 |
RSU vested |  | (193 | ) |  | $ | 54.17 |
RSU forfeited |  | (20 | ) |  | $ | 60.78 |
Outstanding at December 31, 2018 |  | 834 |  |  | $ | 62.51 |
Schedule of Stock Option Activity | The following table summarizes information about stock options:
|  | Number of shares |  | Weighted average exercise price per share |  | Weighted average remaining contractual life |  | Aggregate intrinsic value
Outstanding at December 31, 2017 |  | 12,961 |  |  | $ | 44.36 |  |  |  |  |
Options granted |  | — |  |  | $ | — |  |  |  |  |
Options exercised |  | (3,422 | ) |  | $ | 43.68 |  |  |  |  |
Options forfeited |  | (152 | ) |  | $ | 45.68 |  |  |  |  |
Options canceled |  | (34 | ) |  | $ | 43.36 |  |  |  |  |
Outstanding at December 31, 2018 |  | 9,353 |  |  | $ | 44.60 |  |  | 5.13 |  | $ | 219,719 |
Exercisable at December 31, 2018 |  | 6,570 |  |  | $ | 43.89 |  |  | 4.55 |  | $ | 158,995 |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used | The fair value of each option grant is estimated on the date of grant using the Black-Scholes Model with the following assumptions:
|  | For the years ended December 31,
|  | 2018 |  | 2017 |  | 2016
Dividend yield |  | 1.30 | % |  | 1.50 | % |  | 1.70 | %
Volatility – stock option plans |  | — |  |  | — |  |  | 24 - 25% |
Volatility – stock purchase rights plans |  | 22 | % |  | 14 | % |  | 20 | %
Risk-free interest rates |  | 1.30 | % |  | 1.22 | % |  | 0.51 - 1.42% |
Expected life (years) – stock option plans |  | — |  |  | — |  |  | 5.5 - 6.5 |
Expected life (years) – stock purchase rights plans |  | 1 |  |  | 1 |  |  | 1 |
Weighted average fair value of stock options granted during the period |  | $ | — |  |  | $ | — |  |  | $ | 9.57 |
Weighted average fair value of stock purchase rights granted during the period |  | $ | 17.49 |  |  | $ | 11.69 |  |  | $ | 10.99 |

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- Definition Table presenting the cumulative repurchasing activity under repurchase plans, such as number of shares repurchased and average repurchase price per share + References No definition available. + Details
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- Definition [Table Text Block] for For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset (or liability) could be bought (or incurred) or sold (or settled) in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected and the calculated weighted average fair value of awards granted during the period. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -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 (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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