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Intangible Assets (Schedule of Components of Intangible Assets) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 221,452 | $ 220,192
Accumulated Amortization | 85,381 | 81,265
Carrying Value | 136,071 | 138,927
Contract intangibles | Marine Transportation |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 27,800 | 27,800
Accumulated Amortization | 24,392 | 23,033
Carrying Value | 3,408 | 4,767
Contract intangibles | Offshore pipeline transportation |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 158,101 | 158,101
Accumulated Amortization | 38,832 | 36,752
Carrying Value | 119,269 | 121,349
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 35,551 | 34,291
Accumulated Amortization | 22,157 | 21,480
Carrying Value | $ 13,394 | $ 12,811

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