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Intangible Assets, Goodwill and Other Assets (Schedule of Estimated Amortization Expense) (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Finite-Lived Intangible Assets [Line Items] |
2019 | $ 17,654
2020 | 16,642
2021 | 10,843
2022 | 10,683
2023 | 10,397
Other |
Finite-Lived Intangible Assets [Line Items] |
2019 | 3,153
2020 | 3,132
2021 | 2,011
2022 | 1,853
2023 | 1,568
Sodium minerals and sulfur services | Non-compete agreement |
Finite-Lived Intangible Assets [Line Items] |
2019 | 267
2020 | 177
2021 | 0
2022 | 0
2023 | 0
Onshore facilities and transportation | Customer relationships |
Finite-Lived Intangible Assets [Line Items] |
2019 | 39
2020 | 38
2021 | 37
2022 | 35
2023 | 34
Onshore facilities and transportation | Intangibles associated with lease |
Finite-Lived Intangible Assets [Line Items] |
2019 | 474
2020 | 474
2021 | 474
2022 | 474
2023 | 474
Marine transportation |
Finite-Lived Intangible Assets [Line Items] |
2019 | 5,400
2020 | 4,500
2021 | 0
2022 | 0
2023 | 0
Offshore pipeline transportation services |
Finite-Lived Intangible Assets [Line Items] |
2019 | 8,321
2020 | 8,321
2021 | 8,321
2022 | 8,321
2023 | $ 8,321

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