Intangible Assets (Schedule of Components of Intangible Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 238,578	$ 229,075
Accumulated Amortization	96,507	87,538
Carrying Value	142,071	141,537
Contract intangibles | Offshore pipeline transportation
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	158,101	158,101
Accumulated Amortization	76,277	70,036
Carrying Value	81,824	88,065
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	80,477	70,974
Accumulated Amortization	20,230	17,502
Carrying Value	$ 60,247	$ 53,472