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Intangible Assets, Goodwill and Other Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 396,823 | $ 395,692
Accumulated Amortization | 214,417 | 190,805
Carrying Value | $ 182,406 | 204,887
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Amortization Period in Years | 5 years |
Gross Carrying Amount | $ 28,900 | 28,569
Accumulated Amortization | 13,483 | 10,622
Carrying Value | 15,417 | 17,947
Sodium Minerals and Sulfur Services |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 134,132 | 133,332
Accumulated Amortization | 129,110 | 123,960
Carrying Value | $ 5,022 | 9,372
Sodium Minerals and Sulfur Services | Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Amortization Period in Years | 5 years |
Gross Carrying Amount | $ 94,654 | 94,654
Accumulated Amortization | 92,493 | 89,756
Carrying Value | $ 2,161 | 4,898
Sodium Minerals and Sulfur Services | Licensing agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Amortization Period in Years | 6 years |
Gross Carrying Amount | $ 38,678 | 38,678
Accumulated Amortization | 36,528 | 34,204
Carrying Value | $ 2,150 | 4,474
Sodium Minerals and Sulfur Services | Non-compete agreement |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Amortization Period in Years | 3 years |
Gross Carrying Amount | $ 800 | 0
Accumulated Amortization | 89 | 0
Carrying Value | 711 | 0
Onshore Facilities and Transportation |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 48,690 | 48,690
Accumulated Amortization | 40,015 | 38,135
Carrying Value | $ 8,675 | 10,555
Onshore Facilities and Transportation | Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Amortization Period in Years | 5 years |
Gross Carrying Amount | $ 35,430 | 35,430
Accumulated Amortization | 35,082 | 33,676
Carrying Value | $ 348 | 1,754
Onshore Facilities and Transportation | Intangibles associated with lease |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Amortization Period in Years | 15 years |
Gross Carrying Amount | $ 13,260 | 13,260
Accumulated Amortization | 4,933 | 4,459
Carrying Value | $ 8,327 | 8,801
Marine Transportation |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Amortization Period in Years | 5 years |
Gross Carrying Amount | $ 27,000 | 27,000
Accumulated Amortization | 11,700 | 6,300
Carrying Value | $ 15,300 | 20,700
Offshore Pipeline Transportation |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Amortization Period in Years | 19 years |
Gross Carrying Amount | $ 158,101 | 158,101
Accumulated Amortization | 20,109 | 11,788
Carrying Value | $ 137,992 | $ 146,313

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