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Segment Data (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Segment
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Segment Data [Abstract]          
Number of reportable segments | Segment     2    
Revenues [Abstract]          
Revenues $ 541,159,000 $ 771,042,000 $ 1,185,085,000 $ 1,515,663,000  
Segment profit (loss) 23,834,000 62,709,000 (495,938,000) 121,046,000  
Total assets 6,017,011,000   6,017,011,000   $ 6,079,097,000
Other segment disclosures [Abstract]          
Gain (loss) on disposition of assets (189,000) 3,118,000 303,000 5,275,000  
Interest expense (12,708,000) (15,515,000) (25,507,000) (28,716,000)  
Other income 2,290,000 2,381,000 5,013,000 1,813,000  
Earnings (loss) before taxes on income 23,834,000 62,709,000 (495,938,000) 121,046,000  
Marine Transportation [Member]          
Revenues [Abstract]          
Revenues 380,987,000 404,286,000 784,244,000 772,407,000  
Distribution and Services [Member]          
Revenues [Abstract]          
Revenues 160,172,000 366,756,000 400,841,000 743,256,000  
Other [Member]          
Revenues [Abstract]          
Segment profit (loss) (13,394,000) (13,662,000) (587,600,000) (28,358,000)  
Total assets 326,548,000   326,548,000   120,335,000
Other segment disclosures [Abstract]          
General corporate expenses (2,787,000) (3,646,000) (6,135,000) (6,730,000)  
Gain (loss) on disposition of assets (189,000) 3,118,000 303,000 5,275,000  
Impairments and other charges 0 0 (561,274,000) 0  
Interest expense (12,708,000) (15,515,000) (25,507,000) (28,716,000)  
Other income 2,290,000 2,381,000 5,013,000 1,813,000  
Earnings (loss) before taxes on income (13,394,000) (13,662,000) (587,600,000) (28,358,000)  
Details of "Other" total assets [Abstract]          
General corporate assets 324,293,000   324,293,000   118,310,000
Investment in affiliates 2,255,000   2,255,000   2,025,000
Total other assets 326,548,000   326,548,000   120,335,000
Reporting Segments [Member] | Marine Transportation [Member]          
Revenues [Abstract]          
Revenues 380,987,000 404,286,000 784,244,000 772,407,000  
Segment profit (loss) 51,375,000 53,243,000 102,091,000 88,667,000  
Total assets 4,843,477,000   4,843,477,000   4,536,368,000
Other segment disclosures [Abstract]          
Earnings (loss) before taxes on income 51,375,000 53,243,000 102,091,000 88,667,000  
Reporting Segments [Member] | Distribution and Services [Member]          
Revenues [Abstract]          
Revenues 160,172,000 366,756,000 400,841,000 743,256,000  
Segment profit (loss) (14,147,000) 23,128,000 (10,429,000) 60,737,000  
Total assets 846,986,000   846,986,000   $ 1,422,394,000
Other segment disclosures [Abstract]          
Earnings (loss) before taxes on income (14,147,000) 23,128,000 (10,429,000) 60,737,000  
Intersegment Eliminations [Member]          
Revenues [Abstract]          
Revenues 6,061,000 7,446,000 16,347,000 14,981,000  
Segment profit (loss) 606,000 744,000 1,635,000 1,498,000  
Other segment disclosures [Abstract]          
Earnings (loss) before taxes on income $ 606,000 $ 744,000 $ 1,635,000 $ 1,498,000