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v3.20.1

Equity Plans (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Compensation costs charged to income: | $ 251 | $ 886
Restricted Stock Units (RSUs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of equity instruments granted (shares) | 28,367 | 17,451
Grant date fair value of equity instruments granted (usd per share) | $ 65.89 | $ 51.28
Performance Shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of equity instruments granted (shares) | 24,581 | 30,401
Grant date fair value of equity instruments granted (usd per share) | $ 73.85 | $ 60.46
Performance-based RSU [Member] | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Target vesting percentage | 0.00% |
Performance-based RSU [Member] | 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: | $ 80 | $ 743
Unrecognized compensation costs | $ 6,113 |
Recognition period for unrecognized compensation cost | 2 years 3 months 29 days |
Incentive Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issuable upon exercise of Incentive Plan awards (shares) | 184,130 |
Remaining shares available for issuance under the Incentive Plan (shares) | 759,976 |
CTWS Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issuable upon exercise of Incentive Plan awards (shares) | 101,647 |
Employee Stock Purchase Plan (ESPP) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Compensation costs charged to income: | $ 171 | 143
ESPP proceeds | 970 | 811
Unrecognized compensation costs | $ 102 |
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% |
Plan expense | $ 86 | $ 76
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 |

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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=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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=116856206&loc=d3e5070-113901 + Details
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