Intangible Assets (Schedule of Components of Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 180,965	$ 180,734
Accumulated Amortization	100,516	95,447
Carrying Value	80,449	85,287
Offshore pipeline contract intangibles | Offshore pipeline transportation
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	158,101	158,101
Accumulated Amortization	82,518	78,357
Carrying Value	75,583	79,744
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	22,864	22,633
Accumulated Amortization	17,998	17,090
Carrying Value	$ 4,866	$ 5,543