Goodwill, Other Intangible Assets, And Deferred Charges (Schedule Of Goodwill, Other Intangible Assets, And Deferred Charges) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Goodwill And Other Intangible Assets [Line Items]
Goodwill, Beginning Balance			$ 2,735
Goodwill, Ending Balance	$ 2,735		2,735
Total Indefinite Life Intangibles, Beginning Balance			2,735
Total Indefinite Life Intangibles, Ending Balance	2,735		2,735
Definite Life Intangibles, Beginning Balance			25,042
Definite Life Intangibles, Amortization	(700)	$ (1,000)	(1,253)	$ (2,058)
Definite Life Intangibles, Ending Balance	23,789		23,789
Drydocking Costs, Beginning Balance			25,238
Drydocking Costs, Cash Additions			9,285
Drydocking Costs, Disposals			(2,080)
Drydocking Costs, Amortization			(8,282)
Drydocking Costs, Non-Cash Reclassifications			2,579
Drydocking Costs, Ending Balance	26,740		26,740
Other Deferred Charges, Beginning Balance			549
Other Deferred Charges, Cash Additions			195
Other Deferred Charges, Amortization			(101)
Other Deferred Charges, Non-Cash Reclassifications			77
Other Deferred Charges, Ending Balance	720		720
Total Deferred Charges, Beginning Balance			25,787
Total Deferred Charges, Cash Additions			9,480
Total Deferred Charges, Disposals			(2,080)
Total Deferred Charges, Amortization			(8,383)
Total Deferred Charges, Non-Cash Reclassifications			2,656
Total Deferred Charges, Ending Balance	27,460		$ 27,460
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			(68)
Definite Life Intangibles, Ending Balance	1,289		$ 1,289
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			(10)
Definite Life Intangibles, Ending Balance	365		$ 365
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			(1,173)
Definite Life Intangibles, Ending Balance	$ 22,080		$ 22,080