Segment Data (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) Segment	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			2
Revenues [Abstract]
Total revenues	$ 745,843,000	$ 598,920,000	$ 2,054,589,000	$ 1,655,394,000
Segment profit	50,957,000	(325,594,000)	114,392,000	(313,760,000)
Total assets	5,456,298,000		5,456,298,000		$ 5,399,063,000
Other segment disclosures [Abstract]
Gain on disposition of assets	377,000	830,000	7,971,000	5,082,000
Interest expense	(11,755,000)	(10,500,000)	(32,598,000)	(32,172,000)
Earnings (loss) before taxes on income	50,957,000	(325,594,000)	114,392,000	(313,760,000)
Marine Transportation [Member]
Revenues [Abstract]
Total revenues	433,040,000	338,514,000	1,194,231,000	972,352,000
Distribution and Services [Member]
Revenues [Abstract]
Total revenues	312,803,000	260,406,000	860,358,000	683,042,000
Other [Member]
Revenues [Abstract]
Segment profit	(13,024,000)	(353,548,000)	(25,049,000)	(371,199,000)
Total assets	184,378,000		184,378,000		187,380,000
Other segment disclosures [Abstract]
General corporate expenses	(5,451,000)	(4,997,000)	(12,275,000)	(11,542,000)
Gain on disposition of assets	377,000	830,000	7,971,000	5,082,000
Impairments	0	(340,713,000)	0	(340,713,000)
Interest expense	(11,755,000)	(10,500,000)	(32,598,000)	(32,172,000)
Other income	3,805,000	1,832,000	11,853,000	8,146,000
Earnings (loss) before taxes on income	(13,024,000)	(353,548,000)	(25,049,000)	(371,199,000)
Details of Other total assets [Abstract]
General corporate assets	182,443,000		182,443,000		185,246,000
Investment in affiliates	1,935,000		1,935,000		2,134,000
Total other assets	184,378,000		184,378,000		187,380,000
Reporting Segments [Member] | Marine Transportation [Member]
Revenues [Abstract]
Total revenues	433,040,000	338,514,000	1,194,231,000	972,352,000
Segment profit	41,713,000	16,915,000	89,465,000	37,333,000
Total assets	4,279,784,000		4,279,784,000		4,319,080,000
Other segment disclosures [Abstract]
Earnings (loss) before taxes on income	41,713,000	16,915,000	89,465,000	37,333,000
Reporting Segments [Member] | Distribution and Services [Member]
Revenues [Abstract]
Total revenues	312,803,000	260,406,000	860,358,000	683,042,000
Segment profit	22,268,000	11,039,000	49,976,000	20,106,000
Total assets	992,136,000		992,136,000		$ 892,603,000
Other segment disclosures [Abstract]
Earnings (loss) before taxes on income	22,268,000	11,039,000	49,976,000	20,106,000
Intersegment Eliminations [Member]
Revenues [Abstract]
Total revenues	8,000,000.0	5,400,000	21,900,000	17,600,000
Segment profit	800,000	500,000	2,200,000	1,800,000
Other segment disclosures [Abstract]
Earnings (loss) before taxes on income	$ 800,000	$ 500,000	$ 2,200,000	$ 1,800,000