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Intangible Assets (Schedule of Components of Intangible Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 219,456 | $ 230,908
Accumulated Amortization | 76,741 | 68,306
Carrying Value | 142,715 | 162,602
Intangibles associated with lease | Onshore Facilities & Transportation |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 0 | 13,260
Accumulated Amortization | 0 | 5,407
Carrying Value | 0 | 7,853
Contract intangibles | Marine Transportation |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 27,800 | 27,800
Accumulated Amortization | 21,674 | 17,593
Carrying Value | 6,126 | 10,207
Contract intangibles | Offshore pipeline transportation |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 158,101 | 158,101
Accumulated Amortization | 34,671 | 28,431
Carrying Value | 123,430 | 129,670
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 33,555 | 31,747
Accumulated Amortization | 20,396 | 16,875
Carrying Value | $ 13,159 | $ 14,872

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