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Acquisition (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended |
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Jun. 30, 2014 Barges Boats | Jul. 22, 2013 Barges Tug_Boats
Business Acquisition [Line Items] |  |
Business Acquisition, Transaction Costs |  | $ 230.9
Business Acquisition, Barges Acquired |  | 9
Business Acquisition, Tug Boats Acquired |  | 9
NumberOfBarges | 60 |
NumberOfBoats | 23 |
Property, Plant and Equipment, Estimated Useful Lives | 25 |

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- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155824 + Details
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