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Segment Data (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
Segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Segment Data [Abstract]                        
Number of reportable segments | Segment                   2    
Revenues [Abstract]                        
Revenues                   $ 2,838,399,000 $ 2,970,697,000 $ 2,214,418,000
Segment profit (loss) $ 4,319,000 $ 64,455,000 $ 62,709,000 $ 58,337,000 $ (30,292,000) $ 57,066,000 $ 44,854,000 $ 42,531,000   189,820,000 114,159,000 73,014,000
Total assets 6,079,097,000       5,871,594,000       $ 5,127,427,000 6,079,097,000 5,871,594,000 5,127,427,000
Depreciation and amortization                   219,632,000 224,972,000 202,881,000
Capital expenditures                   248,164,000 301,861,000 177,222,000
Other segment disclosures [Abstract]                        
Interest expense (12,968,000) (14,310,000) (15,515,000) (13,201,000) (12,191,000) (12,345,000) (12,540,000) (9,780,000)   (55,994,000) (46,856,000) (21,472,000)
Impairment of long-lived assets         (82,705,000)       (105,712,000) 0 (82,705,000) (105,712,000)
Impairment of goodwill                   0 (2,702,000) 0
Lease cancellation costs                   0 (2,403,000) 0
Gain (loss) on disposition of assets 3,251,000 (374,000) 3,118,000 2,157,000 (390,000) 18,000 442,000 1,898,000   8,152,000 1,968,000 (4,487,000)
Nonoperating expense 1,110,000 864,000 2,381,000 (568,000) 1,140,000 1,454,000 1,541,000 1,591,000        
Earnings before taxes on income 4,319,000 $ 64,455,000 $ 62,709,000 $ 58,337,000 (30,292,000) $ 57,066,000 $ 44,854,000 $ 42,531,000   189,820,000 114,159,000 73,014,000
Details of "Other" total assets [Abstract]                        
Investment in affiliates 2,025,000       2,495,000         2,025,000 2,495,000  
Marine Transportation [Member]                        
Revenues [Abstract]                        
Revenues                   1,587,082,000 1,483,143,000 1,324,106,000
Distribution and Services [Member]                        
Revenues [Abstract]                        
Revenues                   1,251,317,000 1,487,554,000 890,312,000
Other [Member]                        
Revenues [Abstract]                        
Segment profit (loss)                   (93,223,000) (162,562,000) (149,012,000)
Total assets 120,335,000       72,664,000       75,243,000 120,335,000 72,664,000 75,243,000
Depreciation and amortization                   3,892,000 3,316,000 3,596,000
Capital expenditures                   12,516,000 6,166,000 6,715,000
Other segment disclosures [Abstract]                        
General corporate expenses                   (13,643,000) (35,590,000) (18,202,000)
Interest expense                   (55,994,000) (46,856,000) (21,472,000)
Inventory write-down                   (35,525,000) 0 0
Impairment of long-lived assets                   0 (82,705,000) (105,712,000)
Impairment of goodwill                   0 (2,702,000) 0
Lease cancellation costs                   0 (2,403,000) 0
Gain (loss) on disposition of assets                   8,152,000 1,968,000 (4,487,000)
Nonoperating expense                   3,787,000 5,726,000 861,000
Earnings before taxes on income                   (93,223,000) (162,562,000) (149,012,000)
Details of "Other" total assets [Abstract]                        
General corporate assets 118,310,000       70,169,000       73,353,000 118,310,000 70,169,000 73,353,000
Investment in affiliates 2,025,000       2,495,000       1,890,000 2,025,000 2,495,000 1,890,000
Total other assets 120,335,000       72,664,000       75,243,000 120,335,000 72,664,000 75,243,000
Reportable Segments [Member] | Marine Transportation [Member]                        
Revenues [Abstract]                        
Revenues                   1,587,082,000 1,483,143,000 1,324,106,000
Segment profit (loss)                   215,842,000 147,416,000 135,547,000
Total assets 4,536,368,000       4,145,294,000       3,485,099,000 4,536,368,000 4,145,294,000 3,485,099,000
Depreciation and amortization                   179,742,000 182,307,000 178,898,000
Capital expenditures                   217,364,000 284,953,000 165,421,000
Other segment disclosures [Abstract]                        
Earnings before taxes on income                   215,842,000 147,416,000 135,547,000
Reportable Segments [Member] | Distribution and Services [Member]                        
Revenues [Abstract]                        
Revenues                   1,251,317,000 1,487,554,000 890,312,000
Segment profit (loss)                   67,201,000 129,305,000 86,479,000
Total assets $ 1,422,394,000       $ 1,653,636,000       $ 1,567,085,000 1,422,394,000 1,653,636,000 1,567,085,000
Depreciation and amortization                   35,998,000 39,349,000 20,387,000
Capital expenditures                   18,284,000 10,742,000 5,086,000
Other segment disclosures [Abstract]                        
Earnings before taxes on income                   67,201,000 129,305,000 86,479,000
Intersegment Eliminations [Member]                        
Revenues [Abstract]                        
Revenues                   27,441,000 29,363,000 20,717,000
Segment profit (loss)                   2,744,000 2,936,000 2,072,000
Other segment disclosures [Abstract]                        
Earnings before taxes on income                   $ 2,744,000 $ 2,936,000 $ 2,072,000