Description Of Business And Basis Of Presentation (Narrative) (Details) $ in Millions				6 Months Ended	24 Months Ended
	May 04, 2018 CAD ($)	May 04, 2018 USD ($)	Apr. 25, 2018 USD ($)	Jun. 30, 2018 USD ($) item ft	May 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2013
Description Of Business And Basis Of Presentation [Line Items]
Number or awarded casino licenses | item				7
Number of ship-based casinos | item				13
Number of cruise ship owners | item				4
Equity investment				$ 444,000
Payments for acquisition				200,000
Value of agreement recorded in deposits and other				$ 3,171,000		$ 3,169,000
Number of casino licenses operating | item				5
Percentage Of CBS Owned By CCE [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage				75.00%
Lot Polish Airlines Invesment [Member]
Description Of Business And Basis Of Presentation [Line Items]
Owned by noncontrolling interest				33.30%			33.30%
Casinos Poland Ltd [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage				66.60%
Number of casino licenses owned | item				7
Number of casino licenses operating | item				5
Century Bets! Inc. [Member]
Description Of Business And Basis Of Presentation [Line Items]
Owned by noncontrolling interest				25.00%
Hamilton Properties Ltd. [Member]
Description Of Business And Basis Of Presentation [Line Items]
Number of slot machines | item				200
Number of table games | item				17
Number of electronic table games | item				1
Loan for purchase of equipment				$ 5,000,000
Century Casinos Europe GmbH [Member] | Percentage Of Century Downs Racetrack Owned By Century Casinos Europe [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage				75.00%
Oceania Cruises [Member]
Description Of Business And Basis Of Presentation [Line Items]
Term of consulting agreement					2 years
Consulting Fee					$ 2,000,000
Consulting Fee payable per quarter					$ 250,000
Golden Hospitality Ltd. [Member] | Century Resorts Management [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage				51.00%
Total consideration			$ 600,000
BMO Credit Agreement [Member]
Description Of Business And Basis Of Presentation [Line Items]
Approved borrowing capacity	$ 35.0	$ 26,600,000
Century Downs Racetrack And Casino [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage				75.00%
Owned by noncontrolling interest				25.00%
Minh Chau Ltd. [Member]
Description Of Business And Basis Of Presentation [Line Items]
Equity investment				$ 3,600,000
Minh Chau Ltd. [Member] | Golden Hospitality Ltd. [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership interest				6.36%
Number of electronic table games | item				7
Feet from border station | ft				300
Equity investment			400,000
Period of option to purchase additional equity interest				3 years
Assets recognized			500,000
Liabilities assumed			100,000
Cash acquired			$ 200,000
Value of agreement recorded in deposits and other				$ 100,000
Number of rooms | item				30
Minh Chau Ltd. [Member] | Golden Hospitality Ltd. [Member] | Maximum [Member]
Description Of Business And Basis Of Presentation [Line Items]
Number of electronic table games | item				26
Minh Chau Ltd. [Member] | Golden Hospitality Ltd. [Member] | Future Invesment [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage				51.00%
Equity investment				$ 3,600,000
Minh Chau Ltd. [Member] | Golden Hospitality Ltd. [Member] | Option to Purchase [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage				70.00%
Additional interest to purchase under option, percentage				19.00%