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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Commitments and Contingencies [Abstract] |  |  |
Total rental expense under operating leases | $ 22,658 | $ 29,039 | $ 27,431
Future minimum lease payments for operating leases [Abstract] |  |  |
2019 | 18,911 |  |
2020 | 14,955 |  |
2021 | 10,972 |  |
2022 | 8,790 |  |
2023 | 7,490 |  |
Thereafter | 23,155 |  |
Environmental Matters |  |  |
Accrued environmental liabilities | 12,190 |  |
Accrued environmental liabilities, current | 5,438 |  |
Accrued environmental liabilities, noncurrent | 6,752 |  |
Estimated purchase commitments [Abstract] |  |  |
2019 | 40,697 |  |
2020 | $ 16,792 |  |

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