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Summary of Significant Accounting Policies, Goodwill and Other Intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 14, 2018
Goodwill [Abstract] |  |  |  |
Impairment of goodwill | $ 2,702 | $ 0 | $ 0 |
Gross carrying value of goodwill | 973,995 | 947,502 |  |
Accumulated amortization | 15,566 | 15,566 |  |
Accumulated impairment losses | 4,603 | 1,901 |  |
Net goodwill | 953,826 | 935,135 |  | $ 4,657
Other Intangibles [Abstract] |  |  |  |
Intangible assets gross carrying amounts | 326,984 | 315,983 |  |
Intangible assets accumulated amortization | 102,787 | 83,175 |  |
Intangible assets net carrying amount | 224,197 | 232,808 |  |
Intangible liabilities gross carrying value | 18,323 | 7,437 |  |
Intangible liabilities accumulated amortization | 8,652 | 4,751 |  |
Intangible liabilities net carrying amount | 9,671 | 2,686 |  |
Amortization of intangible assets | 16,760 | 11,296 | $ 8,467 |
Intangible Assets and liabilities, Estimated Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |
2018 | 18,999 |  |  |
2019 | 20,854 |  |  |
2020 | 20,174 |  |  |
2021 | 19,824 |  |  |
2022 | $ 19,782 |  |  |
Weighted average amortization period for intangible assets and liabilities | 14 years |  |  |
Marine Transportation Segment [Member] |  |  |  |
Goodwill [Abstract] |  |  |  |
Net goodwill | $ 405,575 | 387,504 |  |
Distribution and Services Segment [Member] |  |  |  |
Goodwill [Abstract] |  |  |  |
Net goodwill | $ 548,251 | $ 547,631 |  |

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