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Employee Benefits - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2021
USD ($)
installment
shares
Sep. 30, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Healthcare benefit expense, net of employee contributions | $ $ 6,500 $ 5,500 $ 20,600 $ 18,200  
Accrued compensation | $ 60,623   60,623   $ 45,876
Administration expense related to employee contribution plan | $ $ 500 $ 400 $ 1,900 $ 1,600  
Share-based awards granted (in shares) 7,000,000 3,000,000 200,000 100,000  
Number of shares surrendered to satisfy tax withholding obligations     43,000 25,000  
Share based compensation, recognized tax benefits | $ $ 3,000   $ 3,000    
Tax shortfall | $   $ 300   $ 300  
2014 Omnibus Incentive Plan          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Common stock shares available for issuance (in shares) 1,900,000   1,900,000    
Common stock shares authorized (in shares) 3,000,000   3,000,000    
Performance-Based Stock Awards          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Share-based awards granted (in shares)     42,449    
Liability Performance-Based Stock Awards          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Share-based awards granted (in shares) 5,000 7,000 5,000 7,000  
Directors          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Share-based awards granted (in shares) 4,000,000 6,000,000 4,000,000 6,000,000  
Vesting period (in years)     1 year    
Officer | Performance-Based Stock Awards          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Share-based awards granted (in shares)     100,000    
Officer | Performance-Based Stock Awards | Common Stock          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Number of equal installments for common stock | installment     2    
Cost of sales          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Workers' compensation expense | $ $ 4,800 $ 4,100 $ 11,900 $ 11,400  
Medical IBNR Included in Accrued Compensation          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Accrued compensation | $ $ 3,200   $ 3,200   $ 3,100