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Employee Benefits - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) shares | Jun. 30, 2020 USD ($) shares | Jun. 30, 2021 USD ($) installment shares | Jun. 30, 2020 USD ($) shares | Dec. 31, 2020 USD ($)
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |  |  |
Healthcare benefit expense, net of employee contributions | $ | $ 6,800 | $ 5,700 | $ 14,100 | $ 12,700 |
Accrued compensation | $ | 53,415 |  | 53,415 |  | $ 45,876
Administration expense related to employee contribution plan | $ | $ 700 | $ 600 | $ 1,400 | $ 1,200 |
Share-based awards granted (in shares) | 39,000 | 200,000 | 39,000 | 200,000 |
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) | 3,000,000.0 |  | 3,000,000.0 |  |
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 | 6,000 | 4,000 | 6,000 |
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 | $ | $ 2,900 |  | $ 7,100 | $ 7,300 |
Medical IBNR Included in Accrued Compensation |  |  |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |  |  |
Accrued compensation | $ | $ 3,500 |  | $ 3,500 |  | $ 3,100

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