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Commitments and Contingencies - Narrative (Details) - USD ($) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 01, 2017 | Apr. 19, 2017 | Oct. 21, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2018
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |
Rent expense under operating leases longer than 1 month |  |  |  | $ 2,081,000 | $ 2,372,000 | $ 2,561,000 |
Future Minimum Rental Payments Due |  |  |  |  |  |  |
2019 |  |  |  | 2,224,000 |  |  |
2020 |  |  |  | 1,858,000 |  |  |
2021 |  |  |  | 1,357,000 |  |  |
2022 |  |  |  | 977,000 |  |  |
2023 |  |  |  | 481,000 |  |  |
Industrial revenue bonds |  |  |  |  |  |  | $ 10,000
Capital lease obligations |  |  |  | $ 0 |  |  |
Insurance deductible |  |  | $ 250,000 |  |  |  |
OSHA, loss in period |  | $ 138,000 |  |  |  |  |
Payments for legal settlements |  | $ 75,000 |  |  |  |  |
Civil penalties sought | $ 250,000 |  |  |  |  |  |

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