Commitments And Contingencies (Narrative) (Details) $ in Thousands, PLN in Millions, CAD in Millions	6 Months Ended
	Jun. 30, 2015 PLN item	Jun. 30, 2015 USD ($)	Jun. 30, 2014 PLN	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) item	Feb. 25, 2015 CAD	Feb. 25, 2015 USD ($)	Dec. 31, 2014 USD ($)
Commitments and Contingencies [line items]
Contingent liability	PLN 12.0				$ 3,194			$ 3,560
Number of ships for which concession agreements will be terminated	8				8
Review Of Tax Year 2011 [Member]
Commitments and Contingencies [line items]
Paid to Polish IRS	PLN 0.1	$ 100
Review Of Tax Period December 2007 To December 2008 [Member]
Commitments and Contingencies [line items]
Paid to Polish IRS	PLN 3.5	$ 1,200
Review Of Tax Year 2009 [Member]
Commitments and Contingencies [line items]
Paid to Polish IRS			PLN 2.8	$ 900
Century Resorts Alberta, Inc. [Member] | Bank Of Montreal [Member]
Commitments and Contingencies [line items]
Standby letter of credit						CAD 0.3	$ 200
Oceania Cruises [Member]
Commitments and Contingencies [line items]
Term of consulting agreement	2 years	2 years