Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 697,964	$ 559,624	$ 1,308,746	$ 1,056,474
Revenue recognized			46,700	39,200
Marine Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	405,655	332,887	761,191	633,838
Marine Transportation [Member] | Inland Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	316,948	253,588	594,858	478,039
Marine Transportation [Member] | Coastal Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	88,707	79,299	166,333	155,799
Distribution and Services [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	292,309	226,737	547,555	422,636
Distribution and Services [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	161,621	140,966	309,154	273,874
Distribution and Services [Member] | Oil and Gas [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 130,688	$ 85,771	$ 238,401	$ 148,762