Description Of Business And Basis Of Presentation (Narrative) (Details) $ in Thousands, $ in Millions			1 Months Ended				3 Months Ended	9 Months Ended		12 Months Ended
	Aug. 05, 2020 CAD ($)	Aug. 05, 2019 USD ($)	Mar. 31, 2020 USD ($)	Aug. 31, 2019 CAD ($)	May 31, 2019 USD ($)	Aug. 31, 2017 USD ($) item	Dec. 31, 2019 USD ($)	Sep. 30, 2020 USD ($) item	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Aug. 05, 2020 USD ($)	Aug. 05, 2020 CAD ($)	Jul. 30, 2020 USD ($)	Jul. 31, 2019	Apr. 30, 2018	Oct. 31, 2014
Description Of Business And Basis Of Presentation [Line Items]
Number of ship-based casinos | item								4
Number of ship based casinos, operating | item								1
Number of ship based casinos, non operating | item								3
Restricted cash								$ 861	$ 874
Loss on sale of investment									$ (1)
Macquarie Capital [Member]
Description Of Business And Basis Of Presentation [Line Items]
Revolving credit facility, amount drew			$ 9,950
UniCredit Bank Austria [Member]
Description Of Business And Basis Of Presentation [Line Items]
Revolving credit facility, amount drew			7,400
Lot Polish Airlines Invesment [Member] | Polish Airports Company [Member]
Description Of Business And Basis Of Presentation [Line Items]
Owned by noncontrolling interest								33.30%
Casinos Poland [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage								66.60%
Number of casinos owned and operated | item								8
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
Mendoza Central Entretenimientos S. A. [Member]
Description Of Business And Basis Of Presentation [Line Items]
Impairment intangible assets			1,000
Wrote-down receivable			$ 300
Century Bets [Member] | Rocky Mountain Turf Club [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage				25.00%										75.00%
Purchased amount for ownership interest		$ 200		$ 0.2
Century Resorts Management GmbH [Member] | Mendoza Central Entretenimientos S. A. [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership interest								7.50%								7.50%
Century Resorts Management 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%
Golden Hospitality Ltd. [Member]
Description Of Business And Basis Of Presentation [Line Items]
Proceeds from non-interest bearing promissory note					$ 700
Loss on sale of investment										$ (100)
Golden Hospitality Ltd. [Member] | Century Resorts Management [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage								51.00%							51.00%
Century Casino Bath [Member]
Description Of Business And Basis Of Presentation [Line Items]
Gain in general and administrative expenses								$ 7,400
Impaired assets and wrote-down							$ 16,500
Macquarie Capital [Member] | Line of Credit [Member]
Description Of Business And Basis Of Presentation [Line Items]
Line of credit facility													$ 50
Century Sports [Member]
Description Of Business And Basis Of Presentation [Line Items]
Lease term											3 years	3 years
Annual net rent	$ 0.5							$ 400
Century Downs Racetrack And Casino [Member] | Unaffiliated Shareholders [Member]
Description Of Business And Basis Of Presentation [Line Items]
Owned by noncontrolling interest								25.00%
Minh Chau Ltd. [Member] | Golden Hospitality Ltd. [Member] | Golden Hospitality Ltd. [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage					9.21%
Minh Chau Ltd. [Member] | Golden Hospitality Ltd. [Member] | Future Invesment [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage															51.00%
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%
Included In Deposits And Other [Member] | Century Resorts Management GmbH [Member]
Description Of Business And Basis Of Presentation [Line Items]
Restricted cash								$ 600
Deposits Related To Payments Of Prizes And Giveaways [Member] | Casinos Poland [Member]
Description Of Business And Basis Of Presentation [Line Items]
Restricted cash								200
Deposits Related To Insurance Policy [Member] | Maximum [Member]
Description Of Business And Basis Of Presentation [Line Items]
Restricted cash								100
Century Casino Calgary [Member]
Description Of Business And Basis Of Presentation [Line Items]
Amount, sell casino operation											$ 7,500	$ 10.0
Quarterly earn out period	3 years
Loss to general and administrative expenses								100
Held for sale assets in inventories								100
Held for sale assets in property and equipment, net								600
Held for sale liabilities in accrued liabilities								$ 300