Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 831,149	$ 764,772	$ 2,463,561	$ 2,292,464
Revenue recognized			101,800	76,800
Marine Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	486,054	429,885	1,446,274	1,269,342
Marine Transportation [Member] | Inland Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	392,617	353,635	1,170,459	1,043,330
Marine Transportation [Member] | Coastal Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	93,437	76,250	275,815	226,012
Distribution and Services [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	345,095	334,887	1,017,287	1,023,122
Distribution and Services [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	162,285	156,060	470,567	461,159
Distribution and Services [Member] | Power generation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	111,573	119,004	355,025	308,319
Distribution and Services [Member] | Oil and gas [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 71,237	$ 59,823	$ 191,695	$ 253,644