Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 2,784,754	$ 2,246,660	$ 2,171,408
Revenue recognized	61,700	40,900	38,500
Marine Transportation (KMT) [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	1,616,967	1,322,918	1,404,265
Marine Transportation (KMT) [Member] | Inland Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	1,277,010	1,005,145	1,094,630
Marine Transportation (KMT) [Member] | Coastal Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	339,957	317,773	309,635
Distribution and Services [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	1,167,787	923,742	767,143
Distribution and Services [Member] | Oil and Gas [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	516,221	345,731	200,817
Distribution and Services [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 651,566	$ 578,011	$ 566,326