Intangible Assets (Schedule of Components of Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 231,989	$ 229,075
Accumulated Amortization	90,372	87,538
Carrying Value	141,617	141,537
Contract intangibles | Offshore pipeline transportation
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	158,101	158,101
Accumulated Amortization	72,116	70,036
Carrying Value	85,985	88,065
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	73,888	70,974
Accumulated Amortization	18,256	17,502
Carrying Value	$ 55,632	$ 53,472