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Employee Benefit Plans - Schedule of Defined Benefit Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined benefit plans      
Change in projected benefit obligation:      
Projected benefit obligation at beginning of year $ 593,591 $ 544,581  
Interest cost 19,799 23,287 $ 23,836
Benefits paid (31,576) (35,186)  
Actuarial (gains)/losses 55,351 60,909  
Projected benefit obligation at end of year 637,165 593,591 544,581
Plan assets:      
Fair value at beginning of year 420,699 361,891  
Actual return on plan assets 71,071 75,405  
Company contributions 32,633 18,589  
Benefits paid (31,576) (35,186)  
Fair value at end of year 492,827 420,699 361,891
Funded status (144,338) (172,892)  
Amounts recognized in Consolidated Balance Sheets:      
Current liabilities 0 0  
Noncurrent liabilities (144,338) (172,892)  
Total (144,338) (172,892)  
Amounts Recognized in Accumulated Other Comprehensive Loss:      
Net actuarial loss recognized in accumulated other comprehensive loss 123,707 123,065  
Prior service cost recognized in accumulated other comprehensive loss 388 406  
SERPs      
Change in projected benefit obligation:      
Projected benefit obligation at beginning of year 18,541 16,985  
Interest cost 586 718  
Benefits paid (1,236) (1,019)  
Actuarial (gains)/losses 999 1,857  
Projected benefit obligation at end of year 18,890 18,541 16,985
Plan assets:      
Fair value at beginning of year 0 0  
Actual return on plan assets 0 0  
Company contributions 1,236 1,019  
Benefits paid (1,236) (1,019)  
Fair value at end of year 0 0 $ 0
Funded status (18,890) (18,541)  
Amounts recognized in Consolidated Balance Sheets:      
Current liabilities (1,383) (1,214)  
Noncurrent liabilities (17,507) (17,327)  
Total (18,890) (18,541)  
Amounts Recognized in Accumulated Other Comprehensive Loss:      
Net actuarial loss recognized in accumulated other comprehensive loss 7,999 7,240  
Prior service cost recognized in accumulated other comprehensive loss $ 0 $ 0