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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