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Description Of Business And Basis Of Presentation (Narrative) (Details) CAD in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 20, 2015 CAD | Mar. 20, 2015 USD ($) | Jul. 31, 2016 item | Jun. 30, 2015 USD ($) | Sep. 30, 2017 item | Jun. 30, 2016 item | Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Oct. 31, 2014
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |
Number of ship-based casinos | item |  |  |  |  |  |  | 13 |  |  |
Trip period |  |  |  |  |  |  | 4 days |  |  |
Adjusted EBITDA |  |  |  |  |  |  | $ 25,762,000 | $ 22,798,000 | $ 12,850,000 |
Correction of Prior Year Balances [Member] |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |
Corrections to adjusted EBITDA |  |  |  |  |  |  |  | 700,000 |  |
Adjusted EBITDA |  |  |  |  |  |  |  | 22,800,000 |  |
Correction of Prior Year Balances [Member] | As Previously Reported [Member] |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  | $ 23,500,000 |  |
Lot Polish Airlines Invesment [Member] |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |
Owned by noncontrolling interest |  |  |  |  |  |  | 33.30% |  |  |
Century Bets! Inc. [Member] |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 75.00% |  |  |
Owned by noncontrolling interest |  |  |  |  |  |  | 25.00% |  |  |
Casinos Poland Ltd [Member] | Lot Polish Airlines Invesment [Member] |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 66.60% |  |  |
Oceania Cruises [Member] |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |
Number of ships for which concession agreements will be terminated | item |  |  |  |  |  |  | 8 |  |  |
Term of consulting agreement |  |  |  |  |  |  | 2 years |  |  |
Assets held for sale |  |  |  | $ 600,000 |  |  |  |  |  |
Consideration to be received in relation to early termination of concession agreements |  |  |  | $ 4,000,000 |  |  |  |  |  |
Consulting Fee |  |  |  |  |  |  | $ 2,000,000 |  |  |
Consulting Fee payable per quarter |  |  |  |  |  |  | $ 250,000 |  |  |
TUI Cruises, TUI Discovery [Member] |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |
Number of passengers | item |  |  |  |  |  | 2,067 |  |  |  |
TUI Cruises, Mein Schiff 5 [Member] |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |
Number of passengers | item |  |  |  |  |  |  | 2,500 |  |  |
TUI Cruises, Mein Schiff 6 [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |
Number of passengers | item |  |  |  |  | 2,500 |  |  |  |  |
Diamond Cruise International Co. Ltd. [Member] |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |
Number of passengers | item |  |  | 1,200 |  |  |  |  |  |  |
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% |  |  |
Century Downs Racetrack And Casino [Member] | Century Casinos Europe GmbH [Member] |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |
Additional ownership acquired | 60.00% | 60.00% |  |  |  |  |  |  |  |
Amount of credit agreement converted | CAD | CAD 11.0 |  |  |  |  |  |  |  |  |
Gain on conversion of debt receivable to equity recognized in accumulated other comprehensive income |  | $ 100,000 |  |  |  |  |  |  |  |
Gain on conversion of debt receivable to equity |  | $ 600,000 |  |  |  |  |  |  |  |
Century Downs Racetrack And Casino [Member] | BMO Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  | 75.00% |  |  |
Mendoza Central Entretenimientos S. A. [Member] |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  | 7.50% |  |  |
Mendoza Central Entretenimientos S. A. [Member] | Century Casinos Europe GmbH [Member] |  |  |  |  |  |  |  |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  |  |  |  | 7.50%

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