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Intangible Assets, Goodwill and Other Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 196,834 | $ 188,145
Accumulated Amortization | 69,771 | 59,403
Carrying Value | $ 127,063 | 128,742
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Amortization Period in Years | 9 years |
Gross Carrying Amount | $ 37,933 | 29,244
Accumulated Amortization | 15,770 | 13,759
Carrying Value | $ 22,163 | 15,485
Marine transportation |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Amortization Period in Years | 20 years |
Marine transportation | Contract intangible |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 800 | 800
Accumulated Amortization | 607 | 571
Carrying Value | $ 193 | 229
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 | 53,394 | 45,073
Carrying Value | $ 104,707 | $ 113,028

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