Goodwill, Other Intangible Assets, And Deferred Charges (Schedule Of Goodwill, Other Intangible Assets, And Deferred Charges) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Goodwill And Other Intangible Assets [Line Items]
Goodwill, Beginning Balance	$ 2,735		$ 2,735
Goodwill, Ending Balance	2,735		2,735
Total Indefinite Life Intangibles, Beginning Balance	2,735		2,735
Total Indefinite Life Intangibles, Ending Balance	2,735		2,735
Definite Life Intangibles, Beginning Balance	27,727		28,756
Definite Life Intangibles, Amortization	(1,029)	(1,281)	(2,058)	(3,148)
Definite Life Intangibles, Ending Balance	26,698		26,698
Drydocking Costs, Beginning Balance	23,936		26,428
Drydocking Costs, Additions	2,323		4,098
Drydocking Costs, Amortization	(4,457)		(8,591)
Drydocking Costs, Reclassified	482		349
Drydocking Costs, Ending Balance	22,284		22,284
Financing Charges and Other, Beginning Balance	2,792		2,881
Financing Charges and Other, Additions	277		339
Financing Charges and Other, Amortization	(154)		(305)
Financing Charges and Other, Reclassified	76		76
Financing Charges and Other, Ending Balance	2,991		2,991
Total Deferred Charges, Beginning Balance	26,728		29,309
Total Deferred Charges, Additions	2,600		4,437
Total Deferred Charges, Amortization	(4,611)		(8,896)
Total Deferred Charges, Reclassified	558		425
Total Deferred Charges, Ending Balance	25,275		25,275
Trade Names [Member] | Frascati Shops, Inc. And Tower, LLC [Member]
Goodwill And Other Intangible Assets [Line Items]
Amortization period	240 months		240 months
Definite Life Intangibles, Beginning Balance	59		60
Definite Life Intangibles, Amortization	(1)		(2)
Definite Life Intangibles, Ending Balance	58		58
Trade Names [Member] | United Ocean Services, LLC [Member]
Goodwill And Other Intangible Assets [Line Items]
Amortization period	96 months		96 months
Definite Life Intangibles, Beginning Balance	1,505		1,561
Definite Life Intangibles, Amortization	(56)		(112)
Definite Life Intangibles, Ending Balance	1,449		1,449
Customer Relationships [Member] | Frascati Shops, Inc. And Tower, LLC [Member]
Goodwill And Other Intangible Assets [Line Items]
Amortization period	240 months		240 months
Definite Life Intangibles, Beginning Balance	391		396
Definite Life Intangibles, Amortization	(5)		(10)
Definite Life Intangibles, Ending Balance	386		386
Customer Relationships [Member] | United Ocean Services, LLC [Member]
Goodwill And Other Intangible Assets [Line Items]
Amortization period	96 months		96 months
Definite Life Intangibles, Beginning Balance	25,772		26,739
Definite Life Intangibles, Amortization	(967)		(1,934)
Definite Life Intangibles, Ending Balance	$ 24,805		$ 24,805