Deferred Charges And Intangible Assets (Deferred Charges And Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified							12 Months Ended												12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Aug. 06, 2012 Frascati Shops, Inc. And Tower, LLC [Member]		Nov. 30, 2012 United Ocean Services, LLC [Member]		Dec. 31, 2013 Trade Names [Member] Frascati Shops, Inc. And Tower, LLC [Member]	Dec. 31, 2012 Trade Names [Member] Frascati Shops, Inc. And Tower, LLC [Member]	Dec. 31, 2013 Trade Names [Member] United Ocean Services, LLC [Member]	Dec. 31, 2012 Trade Names [Member] United Ocean Services, LLC [Member]	Dec. 31, 2013 Customer Relationships [Member] Frascati Shops, Inc. And Tower, LLC [Member]	Dec. 31, 2012 Customer Relationships [Member] Frascati Shops, Inc. And Tower, LLC [Member]	Dec. 31, 2013 Customer Relationships [Member] United Ocean Services, LLC [Member]	Dec. 31, 2012 Customer Relationships [Member] United Ocean Services, LLC [Member]	Dec. 31, 2013 Favorable Lease [Member] United Ocean Services, LLC [Member]	Dec. 31, 2012 Favorable Lease [Member] United Ocean Services, LLC [Member]	Dec. 31, 2013 Favorable Lease [Member] UOS EBO Acquisition [Member]	Dec. 31, 2012 Favorable Lease [Member] UOS EBO Acquisition [Member]	Dec. 31, 2013 Favorable Charter [Member]	Dec. 31, 2012 Favorable Charter [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill, Gross	$ 2,735	$ 2,700
Goodwill, Net	2,735	2,700	828	[1]	1,907	[2]
Total Indefinite Life Intangibles, Gross Carrying Amount	2,735	2,700
Total Indefinite Life Intangibles, Net Carrying Amount	2,735	2,700
Amortized period							240 months	240 months	96 months	96 months	240 months	240 months	96 months	96 months	13 months	13 months			24 months	24 months
Definite Life Intangibles, Gross Carrying Amount	50,771	50,771					65	65	1,805	1,805	425	425	30,927	30,927	1,071	1,071	11,327	11,327	5,151	5,151
Definite Life Intangibles, Accumulated Amortization	(10,688)	(4,987)					(5)	(1)	(244)	(19)	(29)	(8)	(4,188)	(323)	(1,071)	(129)			(5,151)	(4,507)
Definite Life Intangibles, Reclassified	(11,327)																(11,327)
Definite Life Intangibles, Net Carrying Amount	28,756	45,784					60	64	1,561	1,786	396	417	26,739	30,604		942		11,327		644
Drydocking Costs, Gross	46,667	27,076
Drydocking Costs, Accumulated Amortization	(18,394)	(9,835)
Drydocking Costs, Reclassified	(1,845)
Drydocking Costs	26,428	17,241
Financing Charges and Other, Gross	3,921	3,801
Financing Charges and Other, Accumulated Amortization	(1,040)	(1,150)
Financing Charges and Other	2,881	2,651
Deferred Assets, Gross	50,588	30,877
Deferred Assets, Accumulated Amortization	(19,434)	(10,985)
Deferred Assets, Reclassified	(1,845)
Deferred Assets	$ 29,309	$ 19,892

[1] Goodwill represents the sum of the consideration transferred and the net liabilities assumed and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Our above-described goodwill is not amortized nor do we expect it to be deductible for tax purposes. Specifically, the goodwill recorded as part of the acquisition of the Acquired Companies includes the following: the expected synergies and other benefits that we believe will result from combining the operations of the Acquired Companies with our existing Rail-Ferry operations.any intangible assets that do not qualify for separate recognition, including an assembled workforce of the acquired companies, andthe anticipated higher rate of return of the Acquired Companies existing businesses as going concerns compared to the anticipated rate of return if we had acquired all of the net assets separately.

[2] Goodwill represents the fair value of the consideration transferred over the net assets acquired and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized.  Our above-described goodwill is not amortized nor do we expect it to be deductible for tax purposes.  Specifically, the goodwill recorded as part of the acquisition of UOS includes the following:the expected synergies and other benefits that we believe will result from combining the operations of UOS with our existing Jones Act operations.any intangible assets that do not qualify for separate recognition, including an assembled workforce of the acquired companies, andthe anticipated higher rate of return of UOS’s existing businesses as going concerns compared to the anticipated rate of return if we had acquired all of the net assets separately.