Property, Plant and Equipment (Details) - USD ($) $ in Thousands |
Jun. 30, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Property, Plant, and Equipment | ||
| Total property, plant and equipment, gross | $ 1,443,207 | $ 1,433,588 |
| Less: Accumulated depreciation | 518,621 | 481,629 |
| Total property, plant and equipment, net | 924,586 | 951,959 |
| Machinery and equipment | ||
| Property, Plant, and Equipment | ||
| Total property, plant and equipment, gross | 1,386,140 | 1,378,651 |
| Buildings and improvements | ||
| Property, Plant, and Equipment | ||
| Total property, plant and equipment, gross | 17,534 | 17,221 |
| Automotive equipment | ||
| Property, Plant, and Equipment | ||
| Total property, plant and equipment, gross | 16,637 | 16,691 |
| Land and improvements | ||
| Property, Plant, and Equipment | ||
| Total property, plant and equipment, gross | 14,058 | 14,075 |
| Construction in progress | ||
| Property, Plant, and Equipment | ||
| Total property, plant and equipment, gross | 7,047 | 5,198 |
| Other | ||
| Property, Plant, and Equipment | ||
| Total property, plant and equipment, gross | $ 1,791 | $ 1,752 |