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Segment Data (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Segment
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Segment Data [Abstract]          
Number of reportable segments | Segment     2    
Revenues [Abstract]          
Revenues $ 496,567,000 $ 666,809,000 $ 1,681,652,000 $ 2,182,472,000  
Segment profit (loss) 19,274,000 64,455,000 (476,664,000) 185,501,000  
Total assets 5,981,120,000   5,981,120,000   $ 6,079,097,000
Other segment disclosures [Abstract]          
Gain (loss) on disposition of assets (316,000) (374,000) (13,000) 4,901,000  
Interest expense (11,809,000) (14,310,000) (37,316,000) (43,026,000)  
Other income 1,172,000 864,000 6,185,000 2,677,000  
Earnings (loss) before taxes on income 19,274,000 64,455,000 (476,664,000) 185,501,000  
Marine Transportation [Member]          
Revenues [Abstract]          
Revenues 320,602,000 412,665,000 1,104,846,000 1,185,072,000  
Distribution and Services [Member]          
Revenues [Abstract]          
Revenues 175,965,000 254,144,000 576,806,000 997,400,000  
Other [Member]          
Revenues [Abstract]          
Segment profit (loss) (14,221,000) (17,374,000) (601,821,000) (45,732,000)  
Total assets 371,568,000   371,568,000   120,335,000
Other segment disclosures [Abstract]          
General corporate expenses (3,268,000) (3,554,000) (9,403,000) (10,284,000)  
Gain (loss) on disposition of assets (316,000) (374,000) (13,000) 4,901,000  
Impairments and other charges 0 0 (561,274,000) 0  
Interest expense (11,809,000) (14,310,000) (37,316,000) (43,026,000)  
Other income 1,172,000 864,000 6,185,000 2,677,000  
Earnings (loss) before taxes on income (14,221,000) (17,374,000) (601,821,000) (45,732,000)  
Details of "Other" total assets [Abstract]          
General corporate assets 369,084,000   369,084,000   118,310,000
Investment in affiliates 2,484,000   2,484,000   2,025,000
Total other assets 371,568,000   371,568,000   120,335,000
Reporting Segments [Member] | Marine Transportation [Member]          
Revenues [Abstract]          
Revenues 320,602,000 412,665,000 1,104,846,000 1,185,072,000  
Segment profit (loss) 32,391,000 72,697,000 134,482,000 161,364,000  
Total assets 4,795,002,000   4,795,002,000   4,536,368,000
Other segment disclosures [Abstract]          
Earnings (loss) before taxes on income 32,391,000 72,697,000 134,482,000 161,364,000  
Reporting Segments [Member] | Distribution and Services [Member]          
Revenues [Abstract]          
Revenues 175,965,000 254,144,000 576,806,000 997,400,000  
Segment profit (loss) 1,104,000 9,132,000 (9,325,000) 69,869,000  
Total assets 814,550,000   814,550,000   $ 1,422,394,000
Other segment disclosures [Abstract]          
Earnings (loss) before taxes on income 1,104,000 9,132,000 (9,325,000) 69,869,000  
Intersegment Eliminations [Member]          
Revenues [Abstract]          
Revenues 6,768,000 7,201,000 23,115,000 22,182,000  
Segment profit (loss) 676,000 720,000 2,311,000 2,218,000  
Other segment disclosures [Abstract]          
Earnings (loss) before taxes on income $ 676,000 $ 720,000 $ 2,311,000 $ 2,218,000