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Intangible Assets, Goodwill and Other Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | $ 188,145 | $ 220,192
Accumulated Amortization |  | 59,403 | 81,265
Carrying Value |  | $ 128,742 | 138,927
Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Amortization Period in Years |  | 9 years |
Gross Carrying Amount |  | $ 29,244 | 34,291
Accumulated Amortization |  | 13,759 | 21,480
Carrying Value |  | $ 15,485 | 12,811
Marine transportation |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Amortization Period in Years | [1] | 20 years |
Marine transportation | Contract intangible |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | [1] | $ 800 | 27,800
Accumulated Amortization | [1] | 571 | 23,033
Carrying Value | [1] | $ 229 | 4,767
Offshore pipeline transportation |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Amortization Period in Years |  | 19 years |
Offshore pipeline transportation | Contract intangible |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | $ 158,101 | 158,101
Accumulated Amortization |  | 45,073 | 36,752
Carrying Value |  | $ 113,028 | $ 121,349
[1] | The marine contract intangible associated with the M/T American Phoenix became fully amortized and retired as of September 30, 2020

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