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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