XML 49 R37.htm IDEA: XBRL DOCUMENT v3.22.2
Pensions (Details) - Pension Plans [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Components of Net Periodic Pension Cost [Abstract]          
Service cost $ 256 $ 272 $ 512 $ 543  
Interest cost 334 302 668 604  
Expected return on plan assets (1,054) (913) (2,109) (1,826)  
Amortization of actuarial loss 0 121 0 242  
Amortization of prior service cost (3) (3) (6) (6)  
Rate-regulated adjustment 1,042 796 2,085 1,593  
Net periodic pension expense 575 $ 575 1,150 $ 1,150  
Employer Contributions [Abstract]          
Estimated employer contributions in 2022         $ 2,300
Contributions made by employer     1,150    
Estimated employer contributions in final two quarters of 2022 $ 1,150   $ 1,150