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Description Of Business And Basis Of Presentation (Narrative) (Details) $ in Thousands, € in Millions, $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
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Jul. 16, 2021 USD ($) | Feb. 12, 2021 USD ($) | Feb. 12, 2021 CAD ($) | Aug. 05, 2020 USD ($) | Jun. 30, 2021 USD ($) item | Mar. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) item | Jun. 30, 2021 CAD ($) item | Jun. 30, 2020 USD ($) | Jun. 30, 2021 EUR (€) item | May 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) | 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 |  |  |  |  | 2 |  |  | 2 |  |  | 2 |  |  |  |  |
Number of ship based casinos, ended | item |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Number of ship based casinos, operating | item |  |  |  |  | 1 |  |  | 1 |  |  | 1 |  |  |  |  |
Assets held for sale |  |  |  |  | $ 8,496 |  |  | $ 8,496 |  |  |  |  | $ 8,271 |  |  |
Restricted cash |  |  |  |  | 272 |  | $ 827 | $ 272 |  | $ 827 |  |  |  |  |  |
UniCredit Bank Austria [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, amount drew |  |  |  |  |  | $ 7,400 |  |  |  |  |  |  |  |  |  |
Refinanced amount |  |  |  |  | $ 7,400 |  |  |  |  |  |  |  |  |  |  |
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% |  |  | 33.30% |  |  | 33.30% |  |  |  |  |
Casinos Poland [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 66.60% |  |  | 66.60% |  |  | 66.60% |  |  |  |  |
Number of casinos owned and operated | 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% |  |  | 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% |  |  | 75.00% |  |  | 75.00% |  |  |  |  |
Century Casino Bath [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain in general and administrative expenses |  |  |  |  |  |  | 7,400 |  |  | 7,400 |  |  |  |  |  |
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 |  |  |  |  |  |  | $ 10,000 |
Maturity date |  |  |  |  |  |  |  | Dec. 06, 2024 | Dec. 06, 2024 |  |  |  |  |  |  |
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 Casino Caruthersville [Member] | Subsequent Event [Member] | Hotel [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project costs | $ 1,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan [Member] | UniCredit Bank Austria [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan | € |  |  |  |  |  |  |  |  |  |  | € 6.0 |  |  |  |  |
Maturity date |  |  |  |  |  |  |  | Dec. 31, 2025 | Dec. 31, 2025 |  |  |  |  |  |  |
Term Loan [Member] | Macquarie Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  | Dec. 06, 2026 | Dec. 06, 2026 |  |  |  |  |  |  |
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% |  |  | 25.00% |  |  | 25.00% |  |  |  |  |
Deposits And Other Related To A Cash Guarantee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  | 600 |  |  | 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 | $ 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 | 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 |  |  |  |  | 4,900 |  |  | 4,900 |  |  |  |  |  |  |  |
Century Casino Calgary [Member] | Buildings And Improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets held for sale |  |  |  |  | $ 3,600 |  |  | $ 3,600 |  |  |  |  |  |  |  |

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