Intangible Assets (Schedule of Components of Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 234,946	$ 229,075
Accumulated Amortization	93,198	87,538
Carrying Value	141,748	141,537
Contract intangibles | Offshore pipeline transportation
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	158,101	158,101
Accumulated Amortization	74,196	70,036
Carrying Value	83,905	88,065
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	76,845	70,974
Accumulated Amortization	19,002	17,502
Carrying Value	$ 57,843	$ 53,472