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Employee Benefit Plans 2 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits      
Change in Projected Benefit Obligation:      
Projected benefit obligation at beginning of year $ 272,786 $ 231,852  
Service cost 6,316 5,558 $ 4,441
Interest cost 6,833 7,880 8,527
Actuarial (gain) loss (17,682) 35,453  
Benefits/expenses paid (8,502) (7,957)  
Projected benefit obligation at end of year 259,751 272,786 231,852
Changes in Plan Assets:      
Fair value of plan assets at beginning of year 213,147 192,477  
Actual return on plan assets 25,390 24,909  
Employer contributions 3,489 3,718  
Benefits/expenses paid (8,502) (7,957)  
Fair value of plan assets at end of year 233,524 213,147 192,477
Funded Status:      
Net amount recognized as accrued pension cost (26,227) (59,639)  
Post-Retirement Medical Benefits      
Change in Projected Benefit Obligation:      
Projected benefit obligation at beginning of year 5,906 7,395  
Service cost 149 171 186
Interest cost 110 208 285
Actuarial (gain) loss (3,165) (1,604)  
Benefits/expenses paid (314) (264)  
Projected benefit obligation at end of year 2,686 5,906 7,395
Changes in Plan Assets:      
Fair value of plan assets at beginning of year 12,313 11,271  
Actual return on plan assets 1,773 1,307  
Employer contributions 242 269  
Benefits/expenses paid (555) (534)  
Fair value of plan assets at end of year 13,773 12,313 $ 11,271
Funded Status:      
Net amount recognized as accrued pension cost $ 11,087 $ 6,407