Goodwill, Other Intangible Assets, And Deferred Charges (Schedule Of Goodwill, Other Intangible Assets, And Deferred Charges) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill And Other Intangible Assets [Line Items]
Goodwill, Beginning Balance			$ 2,735
Goodwill, Ending Balance	$ 828		828
Total Indefinite Life Intangibles, Beginning Balance			2,735
Total Indefinite Life Intangibles, Ending Balance	828		828
Definite Life Intangibles, Beginning Balance			25,042
Definite Life Intangibles, Amortization	(700)	$ (1,000)	(1,879)	$ (3,087)
Definite Life Intangibles, Ending Balance	23,163		23,163
Drydocking Costs, Beginning Balance			25,238
Drydocking Costs, Cash Additions			10,821
Drydocking Costs, Impairment/Disposals			(2,080)
Drydocking Costs, Amortization			(11,313)
Drydocking Costs, Non-Cash Reclassifications			1,989
Drydocking Costs, Ending Balance	24,655		24,655
Other Deferred Charges, Beginning Balance			549
Other Deferred Charges, Cash Additions			273
Other Deferred Charges, Amortization			(188)
Other Deferred Charges, Non-Cash Reclassifications			(116)
Other Deferred Charges, Ending Balance	518		518
Total Deferred Charges, Beginning Balance			25,787
Total Deferred Charges, Cash Additions			11,094
Total Deferred Charges, Impairment/Disposals			(2,080)
Total Deferred Charges, Amortization			(11,501)
Total Deferred Charges, Non-Cash Reclassifications			1,873
Total Deferred Charges, Ending Balance	25,173		$ 25,173
Trade Names [Member] | Frascati Shops, Inc. and Tower, LLC [Member]
Goodwill And Other Intangible Assets [Line Items]
Amortization period			240 months
Definite Life Intangibles, Beginning Balance			$ 57
Definite Life Intangibles, Amortization			(2)
Definite Life Intangibles, Ending Balance	55		$ 55
Trade Names [Member] | United Ocean Services, LLC [Member]
Goodwill And Other Intangible Assets [Line Items]
Amortization period			144 months
Definite Life Intangibles, Beginning Balance			$ 1,357
Definite Life Intangibles, Amortization			(103)
Definite Life Intangibles, Ending Balance	1,254		$ 1,254
Customer Relationships [Member] | Frascati Shops, Inc. and Tower, LLC [Member]
Goodwill And Other Intangible Assets [Line Items]
Amortization period			240 months
Definite Life Intangibles, Beginning Balance			$ 375
Definite Life Intangibles, Amortization			(16)
Definite Life Intangibles, Ending Balance	359		$ 359
Customer Relationships [Member] | United Ocean Services, LLC [Member]
Goodwill And Other Intangible Assets [Line Items]
Amortization period			144 months
Definite Life Intangibles, Beginning Balance			$ 23,253
Definite Life Intangibles, Amortization			(1,758)
Definite Life Intangibles, Ending Balance	$ 21,495		$ 21,495