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Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 22, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Significant Accounting Policies [Line Items] |  |  |  |  |
Operating lease right-of-use assets |  | $ 37,040 |  |  |
Operating lease liability |  | 47,177 |  |  |
Outstanding balance of promotional balance liability |  | 1,400 | $ 700 |  |
Impairment - intangible and tangible assets |  | 16,486 |  |  |
Impairment of long-lived assets |  |  | 0 |  |
Contract assets |  | $ 0 | 0 |  |
Initial lease term |  | 14 years 4 months 24 days |  |  |
Advertising costs |  | $ 3,400 | $ 2,200 | $ 2,100 |
US federal income tax statutory rate |  | 21.00% | 21.00% | 35.00% |
Tax Act [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
US federal income tax statutory rate | 21.00% |  |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  | $ 38,300
Operating lease liability |  |  |  |  | $ 40,400
Cumulative-effect adjustment to retained earnings |  | $ 300 |  |  |
Casinos Poland's LIM Center [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Impairment of leasehold |  |  |  | $ 100 |
Century Casino Bath [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Impairment of leasehold |  | 8,000 |  |  |
Included In Deposits And Other [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted cash |  | 886 | $ 709 |  |
Included In Deposits And Other [Member] | Century Casino Bath [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted cash |  | 600 |  |  |
Deposits Related To Payments Of Prizes And Giveaways [Member] | Casinos Poland [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted cash |  | 300 |  |  |
Deposits Related To Insurance Policy [Member] | Maximum [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted cash |  | 100 |  |  |
Opening [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Contract liability |  | 219 | $ 235 |  |
Casino Licenses [Member] | Century Casino Bath [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Impairment - intangible and tangible assets |  | $ 1,200 |  |  |

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