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Employee Benefit Plans - Schedule of defined benefit plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined benefit plans      
Change in projected benefit obligation:      
Projected benefit obligation at beginning of year $ 637,165 $ 593,591  
Interest cost 16,465 19,799 $ 23,287
Benefits paid (31,616) (31,576)  
Actuarial (gains)/losses (18,705) 55,351  
Projected benefit obligation at end of year 603,309 637,165 593,591
Plan assets:      
Fair value at beginning of year 492,827 420,699  
Actual return on plan assets 31,848 71,071  
Company contributions 24,089 32,633  
Benefits paid (31,616) (31,576)  
Fair value at end of year 517,148 492,827 420,699
Funded status (86,161) (144,338)  
Amounts recognized in Consolidated Balance Sheets:      
Current liabilities 0 0  
Noncurrent liabilities (86,161) (144,338)  
Total (86,161) (144,338)  
Amounts Recognized in Accumulated Other Comprehensive Loss:      
Net actuarial loss recognized in accumulated other comprehensive loss 90,197 123,707  
Prior service cost recognized in accumulated other comprehensive loss 370 388  
SERPs      
Change in projected benefit obligation:      
Projected benefit obligation at beginning of year 18,890 18,541  
Interest cost 473 586  
Benefits paid (1,028) (1,236)  
Actuarial (gains)/losses (312) 999  
Projected benefit obligation at end of year 18,023 18,890 18,541
Plan assets:      
Fair value at beginning of year 0 0  
Actual return on plan assets 0 0  
Company contributions 1,028 1,236  
Benefits paid (1,028) (1,236)  
Fair value at end of year 0 0 $ 0
Funded status (18,023) (18,890)  
Amounts recognized in Consolidated Balance Sheets:      
Current liabilities (1,353) (1,383)  
Noncurrent liabilities (16,670) (17,507)  
Total (18,023) (18,890)  
Amounts Recognized in Accumulated Other Comprehensive Loss:      
Net actuarial loss recognized in accumulated other comprehensive loss 7,364 7,999  
Prior service cost recognized in accumulated other comprehensive loss $ 0 $ 0