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Segment Data (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Segment
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments | Segment     2    
Revenues [Abstract]          
Revenues $ 559,624,000 $ 541,159,000 $ 1,056,474,000 $ 1,185,085,000  
Segment profit (loss) 15,845,000 23,834,000 11,834,000 (495,938,000)  
Total assets 5,767,815,000   5,767,815,000   $ 5,924,174,000
Other segment disclosures [Abstract]          
(Gain) loss on disposition of assets 2,119,000 (189,000) 4,252,000 303,000  
Interest expense (10,706,000) (12,708,000) (21,672,000) (25,507,000)  
Earnings (loss) before taxes on income 15,845,000 23,834,000 11,834,000 (495,938,000)  
Marine Transportation [Member]          
Revenues [Abstract]          
Revenues 332,887,000 380,987,000 633,838,000 784,244,000  
Distribution and Services [Member]          
Revenues [Abstract]          
Revenues 226,737,000 160,172,000 422,636,000 400,841,000  
Other [Member]          
Revenues [Abstract]          
Segment profit (loss) (8,789,000) (13,394,000) (17,651,000) (587,600,000)  
Total assets 211,532,000   211,532,000   357,894,000
Other segment disclosures [Abstract]          
General corporate expenses (2,725,000) (2,787,000) (6,545,000) (6,135,000)  
(Gain) loss on disposition of assets 2,119,000 (189,000) 4,252,000 303,000  
Impairments and other charges 0 0 0 (561,274,000)  
Interest expense (10,706,000) (12,708,000) (21,672,000) (25,507,000)  
Other income 2,523,000 2,290,000 6,314,000 5,013,000  
Earnings (loss) before taxes on income (8,789,000) (13,394,000) (17,651,000) (587,600,000)  
Details of Other total assets [Abstract]          
General corporate assets 209,670,000   209,670,000   355,205,000
Investment in affiliates 1,862,000   1,862,000   2,689,000
Total other assets 211,532,000   211,532,000   357,894,000
Reporting Segments [Member] | Marine Transportation [Member]          
Revenues [Abstract]          
Revenues 332,887,000 380,987,000 633,838,000 784,244,000  
Segment profit (loss) 18,478,000 51,375,000 20,418,000 102,091,000  
Total assets 4,723,786,000   4,723,786,000   4,760,449,000
Other segment disclosures [Abstract]          
Earnings (loss) before taxes on income 18,478,000 51,375,000 20,418,000 102,091,000  
Reporting Segments [Member] | Distribution and Services [Member]          
Revenues [Abstract]          
Revenues 226,737,000 160,172,000 422,636,000 400,841,000  
Segment profit (loss) 6,156,000 (14,147,000) 9,067,000 (10,429,000)  
Total assets 832,497,000   832,497,000   $ 805,831,000
Other segment disclosures [Abstract]          
Earnings (loss) before taxes on income 6,156,000 (14,147,000) 9,067,000 (10,429,000)  
Intersegment Eliminations [Member]          
Revenues [Abstract]          
Revenues 7,254,000 6,061,000 12,157,000 16,347,000  
Segment profit (loss) 726,000 606,000 1,216,000 1,635,000  
Other segment disclosures [Abstract]          
Earnings (loss) before taxes on income $ 726,000 $ 606,000 $ 1,216,000 $ 1,635,000