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Intangible Assets (Schedule of Components of Intangible Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 399,072 | $ 396,823
Accumulated Amortization | 230,781 | 214,417
Carrying Value | 168,291 | 182,406
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 31,149 | 28,900
Accumulated Amortization | 15,736 | 13,483
Carrying Value | 15,413 | 15,417
Sodium Minerals & Sulfur Services |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 134,132 | 134,132
Accumulated Amortization | 132,544 | 129,110
Carrying Value | 1,588 | 5,022
Sodium Minerals & Sulfur Services | Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 94,654 | 94,654
Accumulated Amortization | 94,114 | 92,493
Carrying Value | 540 | 2,161
Sodium Minerals & Sulfur Services | Licensing agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 38,678 | 38,678
Accumulated Amortization | 38,141 | 36,528
Carrying Value | 537 | 2,150
Sodium Minerals & Sulfur Services | Non-compete agreement |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 800 | 800
Accumulated Amortization | 289 | 89
Carrying Value | 511 | 711
Onshore Facilities & Transportation |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 48,690 | 48,690
Accumulated Amortization | 40,401 | 40,015
Carrying Value | 8,289 | 8,675
Onshore Facilities & Transportation | Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 35,430 | 35,430
Accumulated Amortization | 35,113 | 35,082
Carrying Value | 317 | 348
Onshore Facilities & Transportation | Intangibles associated with lease |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 13,260 | 13,260
Accumulated Amortization | 5,288 | 4,933
Carrying Value | 7,972 | 8,327
Marine Transportation |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 27,000 | 27,000
Accumulated Amortization | 15,750 | 11,700
Carrying Value | 11,250 | 15,300
Offshore pipeline transportation |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 158,101 | 158,101
Accumulated Amortization | 26,350 | 20,109
Carrying Value | $ 131,751 | $ 137,992

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