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Stock-Based Compensation Plans 2 (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Number of Options |  |  |
Common Shares issued as a result of the exercise of stock options | 1,800 | 30,998 | 32,142
Additional disclosure |  |  |
Cash proceeds from the exercise of stock options | $ 30 | $ 519 | $ 546
Unrecognized compensation cost | $ 122 |  |
Maximum |  |  |
Additional disclosure |  |  |
Percentage of target amount of performance shares | 200.00% |  |
Minimum |  |  |
Additional disclosure |  |  |
Percentage of target amount of performance shares | 0.00% |  |
Weighted Average [Member] |  |  |
Additional disclosure |  |  |
Expected recognition period for unrecognized compensation cost | 1 year 10 months 28 days |  |
Restricted Stock Units |  |  |
Additional disclosure |  |  |
Unrecognized compensation cost related to performance awards | $ 587 |  |
Number of Restricted/Performance Share Units |  |  |
Restricted share units at the beginning of the period (in shares) | 75,071 |  |
Granted (in shares) | 19,307 |  |
Vested (in shares) | (23,713) |  |
Forfeited (in shares) | (1,326) |  |
Restricted share units at the end of the period (in shares) | 69,339 | 75,071 |
Weighted Average Grant-Date Value |  |  |
Restricted share units at the beginning of the period (in dollars per share) | $ 46.92 |  |
Granted (in dollars per share) | 86.41 |  |
Vested (in dollars per share) | 58.56 |  |
Forfeited (in dollars per share) | 78.24 |  |
Restricted share units at the end of the period (in dollars per share) | $ 53.33 | $ 46.92 |
Stock options |  |  |
Additional disclosure |  |  |
Tax benefit for the tax deduction from awards exercised | $ (1,200) | $ (1,800) | (1,600)
Performance awards |  |  |
Additional disclosure |  |  |
Vesting period | 3 years |  |
Period to meet the performance goals | 3 years |  |
Number of Restricted/Performance Share Units |  |  |
Restricted share units at the beginning of the period (in shares) | 84,649 |  |
Granted (in shares) | 16,375 |  |
Performance criteria adjustment (in shares) | (670) |  |
Vested (in shares) | (41,434) |  |
Forfeited (in shares) | (960) |  |
Restricted share units at the end of the period (in shares) | 57,960 | 84,649 |
Weighted Average Grant-Date Value |  |  |
Restricted share units at the beginning of the period (in dollars per share) | $ 51.85 |  |
Granted (in dollars per share) | 89.15 |  |
Performance criteria adjustment (in dollars per share) | 38.14 |  |
Vested (in dollars per share) | 44.80 |  |
Forfeited (in dollars per share) | 82.47 |  |
Restricted share units at the end of the period (in dollars per share) | $ 66.40 | $ 51.85 |
GSWC | Stock options |  |  |
Additional disclosure |  |  |
Tax benefit for the tax deduction from awards exercised | $ (1,200) | $ (1,800) | $ (1,600)

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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