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Restructuring - Summary of Restructuring Charges (Details) - Composite Fibers [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020
Restructuring Cost And Reserve [Line Items] |  |
Severance and benefit continuation | $ 2,689 | $ 6,143
Accelerated depreciation | 1,352 | 3,885
Inventory and spare parts | 935 | 935
Other | 91 | 91
Total | $ 5,067 | $ 11,054

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