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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 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	26,698		28,756
Definite Life Intangibles, Amortization	(1,029)	(1,521)	(3,087)	(4,669)
Definite Life Intangibles, Ending Balance	25,669		25,669
Drydocking Costs, Beginning Balance	22,284		26,428
Drydocking Costs, Additions	2,940		7,038
Drydocking Costs, Amortization	(5,154)		(13,745)
Drydocking Costs, Non-Cash Additions	2,520		2,869
Drydocking Costs, Ending Balance	22,590		22,590
Financing Charges and Other, Beginning Balance	2,991		2,881
Financing Charges and Other, Additions	619		1,034
Financing Charges and Other, Amortization	(563)		(868)
Financing Charges and Other, Non-Cash Additions	347		347
Financing Charges and Other, Ending Balance	3,394		3,394
Total Deferred Charges, Beginning Balance	25,275		29,309
Total Deferred Charges, Additions	3,559		8,072
Total Deferred Charges, Amortization	(5,717)		(14,613)
Total Deferred Charges, Non-Cash Additions	2,867		3,216
Total Deferred Charges, Ending Balance	25,984		25,984
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	58		60
Definite Life Intangibles, Amortization			(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	1,449		1,561
Definite Life Intangibles, Amortization	(57)		(169)
Definite Life Intangibles, Ending Balance	1,392		1,392
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	386		396
Definite Life Intangibles, Amortization	(6)		(16)
Definite Life Intangibles, Ending Balance	380		380
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	24,805		26,739
Definite Life Intangibles, Amortization	(966)		(2,900)
Definite Life Intangibles, Ending Balance	$ 23,839		$ 23,839