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Segment Data (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) Segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  |  |  |  |  |  | 2 |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 2,970,697 | $ 2,214,418 | $ 1,770,673
Segment profit (loss) | $ (30,292) | $ 57,066 | $ 44,854 | $ 42,531 | $ (58,860) | $ 47,861 | $ 43,015 | $ 40,998 | 114,159 | 73,014 | 227,746
Total assets | 5,871,594 |  |  |  | 5,127,427 |  |  |  | 5,871,594 | 5,127,427 | 4,289,895
Depreciation and amortization |  |  |  |  |  |  |  |  | 224,972 | 202,881 | 200,917
Capital expenditures |  |  |  |  |  |  |  |  | 301,861 | 177,222 | 231,066
Other segment disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest expense | (12,191) | (12,345) | (12,540) | (9,780) | (7,162) | (5,388) | (4,465) | (4,457) | (46,856) | (21,472) | (17,690)
Impairment of long-lived assets | (82,705) |  |  |  | (105,712) |  |  |  | (82,705) | (105,712) | 0
Impairment of goodwill |  |  |  |  |  |  |  |  | (2,702) | 0 | 0
Lease Cancellation Costs |  |  |  |  |  |  |  |  | (2,403) | 0 | 0
Gain (loss) on disposition of assets | (390) | 18 | 442 | 1,898 | (4,288) | (159) | (139) | 99 | 1,968 | (4,487) | (127)
Nonoperating expense | 1,140 | 1,454 | 1,541 | 1,591 | 902 | 320 | 228 | (589) |  |  |
Earnings before taxes on income | (30,292) | $ 57,066 | $ 44,854 | $ 42,531 | (58,860) | $ 47,861 | $ 43,015 | $ 40,998 | 114,159 | 73,014 | 227,746
Details of "Other" total assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investment in affiliates | 2,495 |  |  |  | 1,890 |  |  |  | 2,495 | 1,890 |
Marine Transportation [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,483,143 | 1,324,106 | 1,471,893
Distribution and Services [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,487,554 | 890,312 | 298,780
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment profit (loss) |  |  |  |  |  |  |  |  | (162,562) | (149,012) | (34,775)
Total assets | 72,664 |  |  |  | 75,243 |  |  |  | 72,664 | 75,243 | 52,676
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,316 | 3,596 | 3,793
Capital expenditures |  |  |  |  |  |  |  |  | 6,166 | 6,715 | 7,728
Other segment disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
General corporate expenses |  |  |  |  |  |  |  |  | (35,590) | (18,202) | (15,024)
Interest expense |  |  |  |  |  |  |  |  | (46,856) | (21,472) | (17,690)
Impairment of long-lived assets |  |  |  |  |  |  |  |  | (82,705) | (105,712) | 0
Impairment of goodwill |  |  |  |  |  |  |  |  | (2,702) | 0 | 0
Lease Cancellation Costs |  |  |  |  |  |  |  |  | (2,403) | 0 | 0
Gain (loss) on disposition of assets |  |  |  |  |  |  |  |  | 1,968 | (4,487) | (127)
Nonoperating expense |  |  |  |  |  |  |  |  | 5,726 | 861 | (1,934)
Earnings before taxes on income |  |  |  |  |  |  |  |  | (162,562) | (149,012) | (34,775)
Details of "Other" total assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
General corporate assets | 70,169 |  |  |  | 73,353 |  |  |  | 70,169 | 73,353 | 50,054
Investment in affiliates | 2,495 |  |  |  | 1,890 |  |  |  | 2,495 | 1,890 | 2,622
Total other assets | 72,664 |  |  |  | 75,243 |  |  |  | 72,664 | 75,243 | 52,676
Reportable Segments [Member] | Marine Transportation [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,483,143 | 1,324,106 | 1,471,893
Segment profit (loss) |  |  |  |  |  |  |  |  | 147,416 | 135,547 | 259,453
Total assets | 4,145,294 |  |  |  | 3,485,099 |  |  |  | 4,145,294 | 3,485,099 | 3,613,951
Depreciation and amortization |  |  |  |  |  |  |  |  | 182,307 | 178,898 | 184,291
Capital expenditures |  |  |  |  |  |  |  |  | 284,953 | 165,421 | 217,423
Other segment disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Earnings before taxes on income |  |  |  |  |  |  |  |  | 147,416 | 135,547 | 259,453
Reportable Segments [Member] | Distribution and Services [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,487,554 | 890,312 | 298,780
Segment profit (loss) |  |  |  |  |  |  |  |  | 129,305 | 86,479 | 3,068
Total assets | $ 1,653,636 |  |  |  | $ 1,567,085 |  |  |  | 1,653,636 | 1,567,085 | 623,268
Depreciation and amortization |  |  |  |  |  |  |  |  | 39,349 | 20,387 | 12,833
Capital expenditures |  |  |  |  |  |  |  |  | 10,742 | 5,086 | 5,915
Other segment disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Earnings before taxes on income |  |  |  |  |  |  |  |  | 129,305 | 86,479 | 3,068
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 29,363 | 20,717 | 24,672
Segment profit (loss) |  |  |  |  |  |  |  |  | 29,363 | 2,072 | 2,467
Other segment disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Earnings before taxes on income |  |  |  |  |  |  |  |  | $ 29,363 | $ 2,072 | $ 2,467

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