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Leases (Tables) | 12 Months Ended
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Dec. 31, 2016
Leases [Abstract] |
Schedule of Rent Expense | Total rental expense for the years ended December 31, 2016, 2015 and 2014 was as follows (in thousands):
|  | 2016 |  |  | 2015 |  |  | 2014 |
Rental expense: |  |  |  |  |  |  |  |  |
Marine equipment — barges |  | $ | 13,791 |  |  | $ | 14,092 |  |  | $ | 19,780 |
Marine equipment — towing vessels |  |  | 137,609 |  |  |  | 143,067 |  |  |  | 136,331 |
Other buildings and equipment |  |  | 11,182 |  |  |  | 9,383 |  |  |  | 9,146 |
Rental expense |  | $ | 162,582 |  |  | $ | 166,542 |  |  | $ | 165,257 |
Schedule of Future Minimum Lease Payments under Operating Leases | Future minimum lease payments under operating leases that have initial or remaining noncancelable lease terms in excess of one year at December 31, 2016 were as follows (in thousands):
|  | Land, Buildings |  |  | Marine Equipment |  |  |  |
|  | And Equipment |  |  | Barges |  |  | Towing Vessels |  |  | Total |
2017 |  | $ | 12,027 |  |  | $ | 10,419 |  |  | $ | 83,949 |  |  | $ | 106,395 |
2018 |  |  | 11,049 |  |  |  | 8,718 |  |  |  | 20,532 |  |  |  | 40,299 |
2019 |  |  | 8,829 |  |  |  | 4,581 |  |  |  | 314 |  |  |  | 13,724 |
2020 |  |  | 7,508 |  |  |  | 3,813 |  |  |  | — |  |  |  | 11,321 |
2021 |  |  | 7,007 |  |  |  | 1,574 |  |  |  | — |  |  |  | 8,581 |
Thereafter |  |  | 74,390 |  |  |  | 2,474 |  |  |  | — |  |  |  | 76,864 |
|  | $ | 120,810 |  |  | $ | 31,579 |  |  | $ | 104,795 |  |  | $ | 257,184 |

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Tabular disclosure of rental expense from operating leases for each period for which an income statement is presented with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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