Intangible Assets (Schedule of Components of Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 180,874	$ 180,734
Accumulated Amortization	97,958	95,447
Carrying Value	82,916	85,287
Offshore pipeline contract intangibles | Offshore pipeline transportation
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	158,101	158,101
Accumulated Amortization	80,437	78,357
Carrying Value	77,664	79,744
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	22,773	22,633
Accumulated Amortization	17,521	17,090
Carrying Value	$ 5,252	$ 5,543