Goodwill, Other Intangible Assets, And Deferred Charges (Schedule Of Goodwill, Other Intangible Assets, And Deferred Charges) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015		Dec. 31, 2014
Goodwill And Other Intangible Assets [Line Items]
Goodwill, Beginning Balance		$ 2,735
Goodwill Impairment/Disposals	$ 800	$ (2,735)
Goodwill, Ending Balance				$ 2,735
Total Indefinite Life Intangibles, Beginning Balance		$ 2,735
Total Indefinite Life Intangibles, Ending Balance				2,735
Definite Life Intangibles, Beginning Balance		$ 25,042
Definite Life Intangibles, Impairment/Disposals		(22,540)
Definite Life Intangibles, Amortization		$ (2,502)		(3,714)
Definite Life Intangibles, Ending Balance				25,042
Drydocking Costs, Beginning Balance		$ 25,238
Drydocking Costs, Cash Additions		12,816
Drydocking Costs, Impairment/Disposals		(4,455)
Drydocking Costs, Amortization		(13,696)
Drydocking Costs, Non-Cash Reclassifications		2,220
Drydocking Costs, Ending Balance	$ 22,123	22,123		25,238
Other Deferred Charges, Beginning Balance		549
Other Deferred Charges, Cash Additions		820
Other Deferred Charges, Amortization		(455)
Other Deferred Charges, Ending Balance	914	914		549
Total Deferred Charges, Beginning Balance		25,787
Total Deferred Charges, Cash Additions		13,636
Total Deferred Charges, Impairment/Disposals		(4,455)
Total Deferred Charges, Amortization		(14,151)
Total Deferred Charges, Non-Cash Reclassifications		2,220
Total Deferred Charges, Ending Balance	23,037	23,037		25,787
Frascati Shops, Inc. and Tower, LLC [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill Impairment/Disposals	$ 800	828	[1]
United Ocean Services, LLC [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill Impairment/Disposals		$ 1,900
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, Impairment/Disposals		(53)
Definite Life Intangibles, Amortization		$ (4)
Definite Life Intangibles, Ending Balance				57
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, Impairment/Disposals		(1,221)
Definite Life Intangibles, Amortization		$ (136)
Definite Life Intangibles, Ending Balance				1,357
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, Impairment/Disposals		(358)
Definite Life Intangibles, Amortization		$ (17)
Definite Life Intangibles, Ending Balance				375
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, Impairment/Disposals		(20,908)
Definite Life Intangibles, Amortization		$ (2,345)
Definite Life Intangibles, Ending Balance				$ 23,253

[1] Refers to the goodwill associated with our FSI acquisition, which is held for sale.