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Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Percentage of net win retained by Alberta Gaming and Liquor Commission | 85.00% |
Percentage of net win retained by Alberta Gaming and Liquor Commission which is allocated to licensed charities | 15.00% |
Percentage of casino net win allocated to charities for table games excluding poker and craps | 50.00% |
Percentage of casino net win allocated to charities for poker and craps | 25.00% |
Advertising costs | $ 1.6 | $ 1.6
Deferred tax asset resulting from net operating losses in the U.S. | 2.6 |
Deferred tax asset resulting from Calgary Casino purchase | 0.9 |
Deferred tax asset resulting from Century Casinos Europe subsidiary | $ 0.9 |
Casinos Poland Ltd [Member] |  |
Ownership percentage | 33.30% |
Number of persons on management board | 3 |
Number of persons on supervisory board | 3 |
Maximum [Member] |  |
Ownership percentage | 50.00% |
Minimum [Member] |  |
Ownership percentage | 20.00% |

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