Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 610,782	$ 496,850
Revenue recognized	28,600	30,800
Marine Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	355,536	300,951
Marine Transportation [Member] | Inland Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	277,910	224,451
Marine Transportation [Member] | Coastal Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	77,626	76,500
Distribution and Services [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	255,246	195,899
Distribution and Services [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	147,533	132,908
Distribution and Services [Member] | Oil and Gas [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 107,713	$ 62,991