Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 824,390	$ 777,248	$ 1,632,412	$ 1,527,692
Revenue recognized			81,500	60,300
Marine Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	484,808	426,962	960,220	839,457
Marine Transportation [Member] | Inland Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	391,835	351,807	777,842	689,695
Marine Transportation [Member] | Coastal Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	92,973	75,155	182,378	149,762
Distribution and Services [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	339,582	350,286	672,192	688,235
Distribution and Services [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	165,658	152,045	308,282	305,099
Distribution and Services [Member] | Power generation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	107,783	99,006	243,452	189,315
Distribution and Services [Member] | Oil and gas [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 66,141	$ 99,235	$ 120,458	$ 193,821