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Intangible Assets, Goodwill and Other Assets (Schedule of Estimated Amortization Expense) (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Finite-Lived Intangible Assets [Line Items] |
2018 | $ 21,788
2019 | 17,453
2020 | 16,431
2021 | 10,642
2022 | 10,482
Other |
Finite-Lived Intangible Assets [Line Items] |
2018 | 2,974
2019 | 2,952
2020 | 2,921
2021 | 1,810
2022 | 1,652
Sodium Minerals and Sulfur Services | Customer relationships |
Finite-Lived Intangible Assets [Line Items] |
2018 | 2,161
2019 | 0
2020 | 0
2021 | 0
2022 | 0
Sodium Minerals and Sulfur Services | Licensing agreements |
Finite-Lived Intangible Assets [Line Items] |
2018 | 2,150
2019 | 0
2020 | 0
2021 | 0
2022 | 0
Sodium Minerals and Sulfur Services | Non-compete agreement |
Finite-Lived Intangible Assets [Line Items] |
2018 | 267
2019 | 267
2020 | 177
2021 | 0
2022 | 0
Onshore Facilities and Transportation | Customer relationships |
Finite-Lived Intangible Assets [Line Items] |
2018 | 41
2019 | 39
2020 | 38
2021 | 37
2022 | 35
Onshore Facilities and Transportation | Intangibles associated with lease |
Finite-Lived Intangible Assets [Line Items] |
2018 | 474
2019 | 474
2020 | 474
2021 | 474
2022 | 474
Marine Transportation |
Finite-Lived Intangible Assets [Line Items] |
2018 | 5,400
2019 | 5,400
2020 | 4,500
2021 | 0
2022 | 0
Offshore Pipeline Transportation |
Finite-Lived Intangible Assets [Line Items] |
2018 | 8,321
2019 | 8,321
2020 | 8,321
2021 | 8,321
2022 | $ 8,321

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