Property, Plant and Equipment (Details) - USD ($) $ in Thousands |
Sep. 30, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Property, Plant, and Equipment | ||
| Total property, plant and equipment, gross | $ 1,426,558 | $ 1,427,983 |
| Less: Accumulated depreciation | 462,056 | 412,743 |
| Total property, plant and equipment, net | 964,502 | 1,015,240 |
| Machinery and equipment | ||
| Property, Plant, and Equipment | ||
| Total property, plant and equipment, gross | 1,360,019 | 1,362,965 |
| Buildings and improvements | ||
| Property, Plant, and Equipment | ||
| Total property, plant and equipment, gross | 17,116 | 17,116 |
| Automotive equipment | ||
| Property, Plant, and Equipment | ||
| Total property, plant and equipment, gross | 16,719 | 16,773 |
| Land and improvements | ||
| Property, Plant, and Equipment | ||
| Total property, plant and equipment, gross | 13,751 | 13,250 |
| Construction in progress | ||
| Property, Plant, and Equipment | ||
| Total property, plant and equipment, gross | 17,299 | 15,126 |
| Other | ||
| Property, Plant, and Equipment | ||
| Total property, plant and equipment, gross | $ 1,654 | $ 2,753 |