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Pension Plan and Other Postretirement Benefits - Reconciliation of Changes in Fair Value of Plan Assets and Plan's Benefit Obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Plan      
Reconciliation of Fair Value of Plan Assets:      
Fair Value of Plan Assets, beginning balance $ 329,781 $ 269,783  
Actual Return on Plan Assets 35,474 52,640  
Net Company Contribution 11,200 22,500  
Benefit Payments (15,777) (15,142)  
Fair Value of Plan Assets, ending balance $ 360,678 $ 329,781 $ 269,783
Estimated Asset Return 10.70% 19.30%  
Reconciliation of Projected Benefit Obligation:      
Projected Benefit Obligation, beginning balance $ 384,785 $ 328,442  
Service Cost 6,621 5,491 6,459
Interest Cost 13,053 14,412 13,452
Benefit Payments (15,777) (15,142)  
Actuarial Loss 39,714 51,582  
Projected Benefit Obligation, ending balance 428,396 384,785 328,442
Reconciliation of Accrued Postretirement Cost:      
Expense (6,797) (3,376) (6,046)
Net Company Contribution 11,200 22,500  
Executive Survivor and Supplemental Retirement Plan      
Reconciliation of Fair Value of Plan Assets:      
Fair Value of Plan Assets, beginning balance 0 0  
Actual Return on Plan Assets 0 0  
Net Company Contribution 1,505 1,475  
Benefit Payments (1,505) (1,475)  
Fair Value of Plan Assets, ending balance 0 0 0
Reconciliation of Projected Benefit Obligation:      
Projected Benefit Obligation, beginning balance 43,966 39,699  
Service Cost 179 418 408
Interest Cost 1,449 1,735 1,589
Benefit Payments (1,505) (1,475)  
Curtailments 0 (1,671)  
Actuarial Loss 3,805 5,260  
Projected Benefit Obligation, ending balance 47,894 43,966 39,699
Reconciliation of Accrued Postretirement Cost:      
Expense (2,062) (2,647) (2,979)
Net Company Contribution 1,505 1,475  
Other Postretirement Benefits Plan      
Reconciliation of Fair Value of Plan Assets:      
Fair Value of Plan Assets, beginning balance 0 0  
Actual Return on Plan Assets 0 0  
Net Company Contribution 2,662 2,757  
Benefit Payments (6,694) (7,164)  
Participant Premium Payments 4,032 4,407  
Fair Value of Plan Assets, ending balance 0 0 0
Reconciliation of Projected Benefit Obligation:      
Projected Benefit Obligation, beginning balance 71,437 71,561  
Service Cost 1,847 1,286 1,526
Interest Cost 2,393 3,083 2,583
Benefit Payments (6,694) (7,164)  
Participant Premium Payments 4,032 4,407  
Plan Amendments (3,891) (20,864)  
Actuarial Loss 1,061 19,128  
Projected Benefit Obligation, ending balance 70,185 71,437 71,561
Reconciliation of Accrued Postretirement Cost:      
Accrued Postretirement, beginning balance (56,795) (53,574)  
Expense (3,758) (5,978) (5,799)
Net Company Contribution 2,662 2,757  
Accrued Postretirement, ending balance $ (57,891) $ (56,795) $ (53,574)