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Acquisitions and Divestitures (3) Pennsylvania and Florida Jones Act Tankers (Crowley) (Details) - Pennsylvania and Florida Jones Act Tankers (Crowley) [Member]
$ in Millions
Nov. 05, 2014
USD ($)
MBbls
Business Acquisition [Line Items]  
Number of Vessels 2
Business Combination, Consideration Transferred | $ $ 270
Tanker Capacity | MBbls 330