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v3.21.1

Employee Benefits - Additional Information (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) installment shares | Mar. 31, 2020 USD ($) shares | Dec. 31, 2020 USD ($)
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Healthcare benefit expense, net of employee contributions | $ | $ 7,200 | $ 7,000 |
Accrued compensation | $ | 47,520 |  | $ 45,876
Administration expense related to employee contribution plan | $ | $ 700 | $ 600 |
2014 Omnibus Incentive Plan |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Common stock shares available for issuance (in shares) | 1,900,000 |  |
Common stock shares authorized (in shares) | 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 |
Directors |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Share-based awards granted (in shares) | 0 | 316 |
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 | $ | $ 4,200 | $ 4,400 |
Medical IBNR Included in Accrued Compensation |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Accrued compensation | $ | $ 3,300 |  | $ 3,100

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