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Intangible Assets (Schedule of Components of Intangible Assets) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 211,946 | $ 220,192
Accumulated Amortization | 79,977 | 81,265
Carrying Value | 131,969 | 138,927
Contract intangibles | Marine Transportation |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 27,800 | 27,800
Accumulated Amortization | 25,752 | 23,033
Carrying Value | 2,048 | 4,767
Contract intangibles | Offshore pipeline transportation |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 158,101 | 158,101
Accumulated Amortization | 40,912 | 36,752
Carrying Value | 117,189 | 121,349
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 26,045 | 34,291
Accumulated Amortization | 13,313 | 21,480
Carrying Value | $ 12,732 | $ 12,811

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