Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 3,265,876	$ 3,091,640	$ 2,784,754
Revenue recognized	113,800	84,000	61,700
Marine Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	1,913,050	1,721,937	1,616,967
Marine Transportation [Member] | Inland Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	1,553,232	1,416,483	1,277,010
Marine Transportation [Member] | Coastal Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	359,818	305,454	339,957
Distribution and Services [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	1,352,826	1,369,703	1,167,787
Distribution and Services [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	621,991	624,581	576,561
Distribution and Services [Member] | Power Generation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	484,972	403,576	256,713
Distribution and Services [Member] | Oil and Gas [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 245,863	$ 341,546	$ 334,513