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Intangible Assets, Goodwill and Other Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 398,870 | $ 396,823
Accumulated Amortization | 236,268 | 214,417
Carrying Value | $ 162,602 | 182,406
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Amortization Period in Years | 5 years |
Gross Carrying Amount | $ 30,947 | 28,900
Accumulated Amortization | 16,519 | 13,483
Carrying Value | 14,428 | 15,417
Sodium minerals and sulfur services |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 134,132 | 134,132
Accumulated Amortization | 133,688 | 129,110
Carrying Value | $ 444 | 5,022
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 | 94,654 | 92,493
Carrying Value | $ 0 | 2,161
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 | 38,678 | 36,528
Carrying Value | $ 0 | 2,150
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 | 800
Accumulated Amortization | 356 | 89
Carrying Value | 444 | 711
Onshore facilities and transportation |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 48,690 | 48,690
Accumulated Amortization | 40,530 | 40,015
Carrying Value | $ 8,160 | 8,675
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 | 35,123 | 35,082
Carrying Value | $ 307 | 348
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 | 5,407 | 4,933
Carrying Value | $ 7,853 | 8,327
Marine transportation |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Amortization Period in Years | 5 years |
Gross Carrying Amount | $ 27,000 | 27,000
Accumulated Amortization | 17,100 | 11,700
Carrying Value | $ 9,900 | 15,300
Offshore pipeline transportation services |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Amortization Period in Years | 19 years |
Gross Carrying Amount | $ 158,101 | 158,101
Accumulated Amortization | 28,431 | 20,109
Carrying Value | $ 129,670 | $ 137,992

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