Description Of Business And Basis Of Presentation (Narrative) (Details) $ in Thousands, $ in Millions		1 Months Ended	3 Months Ended
	Aug. 05, 2020 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) item	Mar. 31, 2021 CAD ($) item	May 31, 2021 item	Dec. 31, 2020 USD ($)	Aug. 05, 2020 CAD ($)	Dec. 06, 2019 USD ($)	Oct. 31, 2014
Description Of Business And Basis Of Presentation [Line Items]
Number of ship-based casinos | item			4
Assets held for sale			$ 8,374			$ 8,271
Restricted cash		$ 831	268
Canada And Poland [Member]
Description Of Business And Basis Of Presentation [Line Items]
Estimates amount to reopen operations and cover short-term cash			$ 7,000
UniCredit Bank Austria [Member]
Description Of Business And Basis Of Presentation [Line Items]
Revolving credit facility, amount drew		7,400
Subsequent Event [Member]
Description Of Business And Basis Of Presentation [Line Items]
Number of ship based casinos, ended | item					3
Number of ship based casinos, operating | item					1
Lot Polish Airlines Invesment [Member] | Polish Airports Company [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership interest by non-controlling			33.30%
Casinos Poland [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage			66.60%
Number of casinos owned | item			8	8
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 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%
Macquarie Capital [Member] | Revolving Credit Facility [Member]
Description Of Business And Basis Of Presentation [Line Items]
Revolving credit facility, amount drew		9,950
Credit facility amount			$ 10,000					$ 10,000
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			$ 400	$ 0.5
Century Downs Racetrack And Casino [Member] | Unaffiliated Shareholders [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership interest by non-controlling			25.00%
Deposits And Other Related To A Cash Guarantee [Member]
Description Of Business And Basis Of Presentation [Line Items]
Restricted cash		600
Deposits And Other Related To Payments Of Prizes And Giveaways [Member] | Casinos Poland [Member]
Description Of Business And Basis Of Presentation [Line Items]
Restricted cash		200	$ 200
Deposits And Other Related To Insurance Policy [Member] | Maximum [Member]
Description Of Business And Basis Of Presentation [Line Items]
Restricted cash		$ 100	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
Working capital			100	$ 0.1
Century Casino Calgary [Member] | Land [Member]
Description Of Business And Basis Of Presentation [Line Items]
Assets held for sale			4,800
Century Casino Calgary [Member] | Buildings And Improvements [Member]
Description Of Business And Basis Of Presentation [Line Items]
Assets held for sale			$ 3,600