XML 85 R70.htm IDEA: XBRL DOCUMENT v3.22.0.1
Retirement Plans, Schedule of Change in Benefit Obligation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Plan [Member]      
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year $ 508,694 $ 442,861  
Service cost 7,961 7,671 $ 7,364
Interest cost 14,239 15,630 16,493
Actuarial (gain) loss (20,208) 58,851  
Gross benefits paid (11,967) (11,029)  
Settlements (3,447) (5,290)  
Benefit obligation at end of year 495,272 508,694 442,861
Accumulated benefit obligation at end of year 469,508 479,999  
SERP [Member]      
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 1,174 1,225  
Service cost 0 0 0
Interest cost 31 40 52
Actuarial (gain) loss (12) (55)  
Gross benefits paid (160) (146)  
Settlements 0 0  
Benefit obligation at end of year 1,033 1,174 1,225
Accumulated benefit obligation at end of year 1,033 1,174  
Other Postretirement Benefits [Member]      
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 629 662  
Service cost 0 0  
Interest cost 17 22 31
Actuarial (gain) loss (104) (84)  
Gross benefits paid (168) (139)  
Settlements 0 0  
Benefit obligation at end of year 582 629 $ 662
Accumulated benefit obligation at end of year $ 582 $ 629