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Pensions (Details) - Pension Plans [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Components of Net Periodic Pension Cost [Abstract]          
Service cost $ 257 $ 271 $ 769 $ 814  
Interest cost 334 302 1,002 906  
Expected return on plan assets (1,054) (913) (3,163) (2,739)  
Amortization of actuarial loss 0 121 0 363  
Amortization of prior service cost (4) (3) (10) (9)  
Rate-regulated adjustment 1,042 797 3,127 2,390  
Net periodic pension expense 575 $ 575 1,725 $ 1,725  
Employer Contributions [Abstract]          
Estimated employer contributions in 2022         $ 2,300
Contributions made by employer     1,725    
Estimated employer contributions in final quarter of 2022 $ 575   $ 575