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Workers' Compensation Expense (Occupational Disease Costs Activity and Assumptions) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Self Insurance Reserve [Roll Forward]      
Service cost $ 7,564 $ 6,677 $ 7,440
Interest cost $ 5,115 $ 4,922 4,365
Discount Rate      
Self Insurance Reserve [Roll Forward]      
Discount rate 0.0248 0.0331  
Occupational disease      
Self Insurance Reserve [Roll Forward]      
Beginning of period $ 158,325 $ 118,900  
Service cost 7,564 6,677  
Interest cost 5,115 4,922  
Actuarial (gain) loss 19,327 35,993  
Benefit and administrative payments (7,330) (8,167)  
End of period $ 183,001 $ 158,325 $ 118,900