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Leases, Schedule of Rent Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Property Subject To Or Available for Operating Lease [Line Items] |  |  |
Rental expense | $ 166,542 | $ 165,257 | $ 156,016
Other Buildings and Equipment [Member] |  |  |
Property Subject To Or Available for Operating Lease [Line Items] |  |  |
Rental expense | 9,383 | 9,146 | 10,298
Tank Barges [Member] | Marine Equipment [Member] |  |  |
Property Subject To Or Available for Operating Lease [Line Items] |  |  |
Rental expense | 14,092 | 19,780 | 20,841
Towing Vessels [Member] | Marine Equipment [Member] |  |  |
Property Subject To Or Available for Operating Lease [Line Items] |  |  |
Rental expense | $ 143,067 | $ 136,331 | $ 124,877
Minimum [Member] | Tank Barges [Member] |  |  |
Property Subject To Or Available for Operating Lease [Line Items] |  |  |
Lease agreements expiring terms | 1 year |  |
Minimum [Member] | Towing Vessels [Member] |  |  |
Property Subject To Or Available for Operating Lease [Line Items] |  |  |
Lease agreements expiring terms | 30 days |  |
Maximum [Member] | Tank Barges [Member] |  |  |
Property Subject To Or Available for Operating Lease [Line Items] |  |  |
Lease agreements expiring terms | 12 years |  |
Maximum [Member] | Towing Vessels [Member] |  |  |
Property Subject To Or Available for Operating Lease [Line Items] |  |  |
Lease agreements expiring terms | 5 years |  |

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- Definition Refers to lease agreements expiring terms, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + 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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