Intangible Assets (Schedule of Components of Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 219,890	$ 203,292
Accumulated Amortization	81,610	75,972
Carrying Value	138,280	127,320
Contract intangibles | Offshore pipeline transportation
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	158,101	158,101
Accumulated Amortization	65,876	61,715
Carrying Value	92,225	96,386
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	61,789	45,191
Accumulated Amortization	15,734	14,257
Carrying Value	$ 46,055	$ 30,934