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Equity Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Restricted stock and deferred restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation costs | $ 5,442 |  | $ 5,442 |
Recognition period for unrecognized compensation cost |  |  | 1 year 8 months 19 days |
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of equity instruments granted (in shares) | 1,134 | 761 | 46,567 | 43,474
Service-based restricted stock vesting period | 1 year | 3 years | 1 year | 3 years
Grant date fair value of equity instruments granted (usd per share) | $ 69.20 | $ 58.63 | $ 64.65 | $ 63.87
Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of equity instruments granted (in shares) | 0 | 58 | 30,641 | 24,777
Grant date fair value of equity instruments granted (usd per share) | $ 0.00 | $ 62.95 | $ 66.33 | $ 65.02
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 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Target vesting percentage |  |  | 0.00% |
Market-based RSU | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Target vesting percentage |  |  | 200.00% |
Incentive Plan | Restricted stock and deferred restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issuable upon exercise of Incentive Plan awards (in shares) | 174,154 |  | 174,154 |
Remaining shares available for issuance under the Incentive Plan (in shares) | 685,660 |  | 685,660 |
CTWS Plan | Restricted stock and deferred restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issuable upon exercise of Incentive Plan awards (in shares) | 56,326 |  | 56,326 |
Employee Stock Purchase Plan (ESPP) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation costs | $ 124 |  | $ 124 |
Plan expense | $ 91 | $ 85 | $ 265 | $ 244

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