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v3.20.2

Equity Plans (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation costs charged to income: | $ 1,058 | $ 952 | $ 2,318 | $ 2,556
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of equity instruments granted (shares) | 761 | 0 | 43,474 | 26,565
Grant date fair value of equity instruments granted (usd per share) | $ 58.63 | $ 0 | $ 63.87 | $ 51.42
Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of equity instruments granted (shares) | 58 | 0 | 24,777 | 30,401
Grant date fair value of equity instruments granted (usd per share) | $ 62.95 | $ 0 | $ 65.02 | $ 60.46
Performance Shares | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Target vesting percentage |  |  | 0.00% |
Performance Shares | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Target vesting percentage |  |  | 150.00% |
Market-based RSU [Member] | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Target vesting percentage |  |  | 0.00% |
Market-based RSU [Member] | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Target vesting percentage |  |  | 200.00% |
Restricted stock and deferred restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation costs charged to income: | $ 906 | $ 812 | $ 1,995 | $ 2,273
Unrecognized compensation costs | $ 4,987 |  | $ 4,987 |
Recognition period for unrecognized compensation cost |  |  | 1 year 10 months 9 days |
Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issuable upon exercise of Incentive Plan awards (shares) |  |  | 182,367 |
Remaining shares available for issuance under the Incentive Plan (shares) | 743,038 |  | 743,038 |
CTWS Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issuable upon exercise of Incentive Plan awards (shares) |  |  | 66,430 |
Employee Stock Purchase Plan (ESPP) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation costs charged to income: | $ 152 | 140 | $ 323 | 283
ESPP proceeds | 860 | 792 | 1,830 | 1,603
Unrecognized compensation costs | $ 116 |  | $ 116 |
Purchase price of common stock under ESPP (percent) |  |  | 85.00% |
Maximum percentage of base compensation employees can designate for stock purchases under ESPP (percent) | 10.00% |  | 10.00% |
Plan expense | $ 85 | $ 82 | $ 244 | $ 223
Employee Stock Purchase Plan (ESPP) | Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized for issuance under the plan (shares) | 400,000 |  | 400,000 |

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- Definition The number of grants made 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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- 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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