Deferred Charges And Intangible Assets (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill And Other Intangible Assets [Line Items]
Intangible assets related to the favorable early buy-out to the new cost basis of the tug/barge unit, reclassified	$ 11,327,000
Amortization of Intangible Assets	5,701,000	3,055,000	1,932,000
Amortization of deferred assets	11,600,000	8,000,000
U S United Ocean Services Llc Frascati Shops Inc [Member]
Goodwill And Other Intangible Assets [Line Items]
Additions	35,000
Favorable Lease [Member] | UOS EBO Acquisition [Member]
Goodwill And Other Intangible Assets [Line Items]
Intangible assets related to the favorable early buy-out to the new cost basis of the tug/barge unit, reclassified	$ 11,327,000