Intangible Assets (Schedule of Components of Intangible Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 226,381	$ 203,292
Accumulated Amortization	84,678	75,972
Carrying Value	141,703	127,320
Contract intangibles | Offshore pipeline transportation
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	158,101	158,101
Accumulated Amortization	67,956	61,715
Carrying Value	90,145	96,386
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	68,280	45,191
Accumulated Amortization	16,722	14,257
Carrying Value	$ 51,558	$ 30,934