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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 |  |  |  |  |
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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 |  |  |  |  |  |  |  |

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