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Equity Plans - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Restricted stock and deferred restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation costs $ 6,528   $ 6,528  
Recognition period for unrecognized compensation cost     1 year 10 months 28 days  
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of equity instruments granted (in shares) 11,732 14,346 45,433 42,713
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) $ 65.43 $ 60.17 $ 64.53 $ 63.97
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of equity instruments granted (in shares) 1,182 138 30,641 24,719
Grant date fair value of equity instruments granted (usd per share) $ 65.70 $ 66.99 $ 66.33 $ 72.01
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) 174,489   174,489  
Remaining shares available for issuance under the Incentive Plan (in shares) 685,578   685,578  
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) 56,056   56,056  
Employee Stock Purchase Plan (ESPP)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation costs $ 30   $ 30  
Plan expense $ 86 $ 74 $ 174 $ 160