Segment Data (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($)	Dec. 31, 2022 USD ($) Segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment Data [Abstract]
Number of reportable segments | Segment		2
Revenues [Abstract]
Revenues		$ 2,784,754	$ 2,246,660	$ 2,171,408
Segment profit (loss)		164,975	(290,601)	(461,351)
Total assets		5,554,924	5,399,063
Depreciation and amortization		201,443	213,718	219,921
Capital expenditures		172,606	98,015	148,185
Other segment disclosures [Abstract]
Gain on disposition of assets		8,279	5,761	118
Impairments and other charges	$ (8,000)
Interest expense		(44,588)	(42,469)	(48,739)
Earnings (loss) before taxes on income		164,975	(290,601)	(461,351)
Details of "Other" total assets [Abstract]
Investment in affiliates		2,171	2,134
Marine Transportation (KMT) [Member]
Revenues [Abstract]
Revenues		1,616,967	1,322,918	1,404,265
Distribution and Services [Member]
Revenues [Abstract]
Revenues		1,167,787	923,742	767,143
Other [Member]
Revenues [Abstract]
Segment profit (loss)		(38,246)	(381,223)	(612,798)
Total assets		227,436	187,380
Depreciation and amortization		7,116	7,166	4,868
Capital expenditures		3,723	5,558	9,341
Other segment disclosures [Abstract]
General corporate expenses		(18,614)	(13,803)	(11,050)
Gain on disposition of assets		8,279	5,761	118
Impairments and other charges		0	(340,713)	(561,274)
Interest expense		(44,588)	(42,469)	(48,739)
Other income		16,677	10,001	8,147
Earnings (loss) before taxes on income		(38,246)	(381,223)	(612,798)
Details of "Other" total assets [Abstract]
General corporate assets		225,265	185,246
Investment in affiliates		2,171	2,134
Total other assets		227,436	187,380
Reportable Segments [Member] | Marine Transportation (KMT) [Member]
Revenues [Abstract]
Revenues		1,616,967	1,322,918	1,404,265
Segment profit (loss)		136,184	63,015	163,638
Total assets		4,285,647	4,319,080
Depreciation and amortization		177,551	185,979	186,798
Capital expenditures		147,170	84,353	133,990
Other segment disclosures [Abstract]
Earnings (loss) before taxes on income		136,184	63,015	163,638
Reportable Segments [Member] | Distribution and Services [Member]
Revenues [Abstract]
Revenues		1,167,787	923,742	767,143
Segment profit (loss)		67,037	27,607	(12,191)
Total assets		1,041,841	892,603
Depreciation and amortization		16,776	20,573	28,255
Capital expenditures		21,713	8,104	4,854
Other segment disclosures [Abstract]
Earnings (loss) before taxes on income		67,037	27,607	(12,191)
Intersegment Eliminations [Member]
Revenues [Abstract]
Revenues		31,900	23,600	27,800
Segment profit (loss)		3,200	2,400	2,800
Other segment disclosures [Abstract]
Earnings (loss) before taxes on income		$ 3,200	$ 2,400	$ 2,800