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Stock-Based Compensation Plans 2 (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Number of Options |  |  |
Common Shares issued as a result of the exercise of stock options | 0 | 1,800 | 30,998
Additional disclosure |  |  |
Cash proceeds from the exercise of stock options |  | $ 30 | $ 519
Unrecognized compensation cost | $ 115 |  |
Weighted Average Grant-Date Value |  |  |
Capitalized equity-based compensation cost | $ 336 | $ 299 | 265
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 6 months |  |
Restricted Stock Units |  |  |
Additional disclosure |  |  |
Unrecognized compensation cost related to performance awards | $ 507 |  |
Number of Restricted/Performance Share Units |  |  |
Restricted share units at the beginning of the period (in shares) | 69,339 |  |
Granted (in shares) | 21,765 |  |
Vested (in shares) | (38,208) |  |
Forfeited (in shares) | (1,786) |  |
Restricted share units at the end of the period (in shares) | 51,110 | 69,339 |
Weighted Average Grant-Date Value |  |  |
Restricted share units at the beginning of the period (in dollars per share) | $ 53.33 |  |
Granted (in dollars per share) | 79.38 |  |
Vested (in dollars per share) | 74.15 |  |
Forfeited (in dollars per share) | 82.87 |  |
Restricted share units at the end of the period (in dollars per share) | $ 47.83 | $ 53.33 |
Stock options |  |  |
Additional disclosure |  |  |
Tax benefit for the tax deduction from awards exercised | $ (1,400) | $ (1,200) | (1,800)
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) | 57,960 |  |
Granted (in shares) | 19,873 |  |
Performance criteria adjustment (in shares) | (1,775) |  |
Vested (in shares) | (26,258) |  |
Forfeited (in shares) | (890) |  |
Restricted share units at the end of the period (in shares) | 48,910 | 57,960 |
Weighted Average Grant-Date Value |  |  |
Restricted share units at the beginning of the period (in dollars per share) | $ 66.4 |  |
Granted (in dollars per share) | 79.43 |  |
Performance criteria adjustment (in dollars per share) | 109.09 |  |
Vested (in dollars per share) | 56.49 |  |
Forfeited (in dollars per share) | 79.29 |  |
Restricted share units at the end of the period (in dollars per share) | $ 75.23 | $ 66.4 |
GSWC |  |  |
Weighted Average Grant-Date Value |  |  |
Capitalized equity-based compensation cost | $ 336 | $ 299 | 265
GSWC | Stock options |  |  |
Additional disclosure |  |  |
Tax benefit for the tax deduction from awards exercised | $ (1,400) | $ (1,200) | $ (1,800)

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