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Employee Benefit Plans 2 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits      
Change in Projected Benefit Obligation:      
Projected benefit obligation at beginning of year $ 231,852 $ 196,082  
Service cost 5,558 4,441 $ 5,342
Interest cost 7,880 8,527 7,646
Actuarial (gain) loss 35,453 29,784  
Benefits/expenses paid (7,957) (6,982)  
Projected benefit obligation at end of year 272,786 231,852 196,082
Changes in Plan Assets:      
Fair value of plan assets at beginning of year 192,477 162,529  
Actual return on plan assets 24,909 33,018  
Employer contributions 3,718 3,913  
Benefits/expenses paid (7,957) (6,983)  
Fair value of plan assets at end of year 213,147 192,477 162,529
Funded Status:      
Net amount recognized as accrued pension cost (59,639) (39,375)  
Post-Retirement Medical Benefits      
Change in Projected Benefit Obligation:      
Projected benefit obligation at beginning of year 7,395 7,886  
Service cost 171 186 218
Interest cost 208 285 292
Actuarial (gain) loss (1,604) (538)  
Benefits/expenses paid (264) (424)  
Projected benefit obligation at end of year 5,906 7,395 7,886
Changes in Plan Assets:      
Fair value of plan assets at beginning of year 11,271 10,010  
Actual return on plan assets 1,307 1,685  
Employer contributions 269 170  
Benefits/expenses paid (534) (594)  
Fair value of plan assets at end of year 12,313 11,271 $ 10,010
Funded Status:      
Net amount recognized as accrued pension cost $ 6,407 $ 3,876