Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 764,772	$ 745,843	$ 2,292,464	$ 2,054,589
Revenue recognized			76,800	54,600
Marine Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	429,885	433,040	1,269,342	1,194,231
Marine Transportation [Member] | Inland Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	353,635	345,052	1,043,330	939,910
Marine Transportation [Member] | Coastal Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	76,250	87,988	226,012	254,321
Distribution and Services [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	334,887	312,803	1,023,122	860,358
Distribution and Services [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	211,485	165,361	581,275	474,515
Distribution and Services [Member] | Oil and Gas [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 123,402	$ 147,442	$ 441,847	$ 385,843