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Segment Data (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Data [Abstract]                        
Number of reportable segments | Segment                   2    
Revenues [Abstract]                        
Revenues                   $ 2,171,408,000 $ 2,838,399,000 $ 2,970,697,000
Segment profit (loss) $ 15,313,000 $ 19,274,000 $ 23,834,000 $ (519,772,000) $ 4,319,000 $ 64,455,000 $ 62,709,000 $ 58,337,000   (461,351,000) 189,820,000 114,159,000
Total assets 5,924,174,000       6,079,097,000         5,924,174,000 6,079,097,000  
Depreciation and amortization                   219,921,000 219,632,000 224,972,000
Capital expenditures                   148,185,000 248,164,000 301,861,000
Other segment disclosures [Abstract]                        
Gain on disposition of assets 131,000 (316,000) (189,000) 492,000 3,251,000 (374,000) 3,118,000 2,157,000   118,000 8,152,000 1,968,000
Impairments and other charges       (8,000,000) (35,525,000)       $ (82,705,000)      
Lease cancellation costs                   0 0 (2,403,000)
Interest expense (11,423,000) (11,809,000) (12,708,000) (12,799,000) (12,968,000) (14,310,000) (15,515,000) (13,201,000)   (48,739,000) (55,994,000) (46,856,000)
Other income 1,962,000 1,172,000 2,290,000 2,723,000 1,110,000 864,000 2,381,000 (568,000)        
Earnings (loss) before taxes on income 15,313,000 $ 19,274,000 $ 23,834,000 $ (519,772,000) 4,319,000 $ 64,455,000 $ 62,709,000 $ 58,337,000   (461,351,000) 189,820,000 114,159,000
Details of "Other" total assets [Abstract]                        
Investment in affiliates 2,689,000       2,025,000         2,689,000 2,025,000  
Marine Transportation [Member]                        
Revenues [Abstract]                        
Revenues                   1,404,265,000 1,587,082,000 1,483,143,000
Distribution and Services [Member]                        
Revenues [Abstract]                        
Revenues                   767,143,000 1,251,317,000 1,487,554,000
Other [Member]                        
Revenues [Abstract]                        
Segment profit (loss)                   (612,798,000) (93,223,000) (162,562,000)
Total assets 357,894,000       120,335,000         357,894,000 120,335,000  
Depreciation and amortization                   4,868,000 3,892,000 3,316,000
Capital expenditures                   9,341,000 12,516,000 6,166,000
Other segment disclosures [Abstract]                        
General corporate expenses                   (11,050,000) (13,643,000) (35,590,000)
Gain on disposition of assets                   118,000 8,152,000 1,968,000
Impairments and other charges                   (561,274,000) (35,525,000) (85,407,000)
Lease cancellation costs                   0 0 (2,403,000)
Interest expense                   (48,739,000) (55,994,000) (46,856,000)
Other income                   8,147,000 3,787,000 5,726,000
Earnings (loss) before taxes on income                   (612,798,000) (93,223,000) (162,562,000)
Details of "Other" total assets [Abstract]                        
General corporate assets 355,205,000       118,310,000         355,205,000 118,310,000  
Investment in affiliates 2,689,000       2,025,000         2,689,000 2,025,000  
Total other assets 357,894,000       120,335,000         357,894,000 120,335,000  
Reportable Segments [Member] | Marine Transportation [Member]                        
Revenues [Abstract]                        
Revenues                   1,404,265,000 1,587,082,000 1,483,143,000
Segment profit (loss)                   163,638,000 215,842,000 147,416,000
Total assets 4,760,449,000       4,536,368,000         4,760,449,000 4,536,368,000  
Depreciation and amortization                   186,798,000 179,742,000 182,307,000
Capital expenditures                   133,990,000 217,364,000 284,953,000
Other segment disclosures [Abstract]                        
Earnings (loss) before taxes on income                   163,638,000 215,842,000 147,416,000
Reportable Segments [Member] | Distribution and Services [Member]                        
Revenues [Abstract]                        
Revenues                   767,143,000 1,251,317,000 1,487,554,000
Segment profit (loss)                   (12,191,000) 67,201,000 129,305,000
Total assets $ 805,831,000       $ 1,422,394,000         805,831,000 1,422,394,000  
Depreciation and amortization                   28,255,000 35,998,000 39,349,000
Capital expenditures                   4,854,000 18,284,000 10,742,000
Other segment disclosures [Abstract]                        
Earnings (loss) before taxes on income                   (12,191,000) 67,201,000 129,305,000
Intersegment Eliminations [Member]                        
Revenues [Abstract]                        
Revenues                   27,782,000 27,441,000 29,363,000
Segment profit (loss)                   2,778,000 2,744,000 2,936,000
Other segment disclosures [Abstract]                        
Earnings (loss) before taxes on income                   $ 2,778,000 $ 2,744,000 $ 2,936,000