Unaudited Summarized Quarterly Data (Details) $ / shares in Units, $ in Thousands, CAD in Millions	1 Months Ended	3 Months Ended								12 Months Ended
	Oct. 31, 2016 CAD	Dec. 31, 2017 USD ($) $ / shares	Sep. 30, 2017 USD ($) $ / shares	Jun. 30, 2017 USD ($) $ / shares	Mar. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 USD ($) $ / shares	Sep. 30, 2016 USD ($) $ / shares	Jun. 30, 2016 USD ($) $ / shares	Mar. 31, 2016 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 USD ($) $ / shares	Dec. 31, 2015 USD ($) $ / shares
Net operating revenue		$ 39,293	$ 41,048	$ 37,330	$ 36,398	$ 36,279	$ 34,526	$ 35,201	$ 33,226	$ 154,069	$ 139,234	$ 133,734
Earnings from operations		1,706	4,777	3,641	4,490	3,706	3,835	4,541	4,082	14,615	16,165	15,796
Net earnings (loss)		(5,030)	7,952	2,170	2,797	4,334	2,413	4,326	2,740	7,891	13,813	12,991
Net earnings (loss) attributable to Century Casinos, Inc. shareholders		$ (5,334)	$ 7,630	$ 1,802	$ 2,159	$ 2,798	$ 1,887	$ 2,249	$ 2,281	$ 6,259	$ 9,215	$ 11,520
Basic earnings per share:
Earnings from continuing operations | $ / shares		$ 0.07	$ 0.20	$ 0.15	$ 0.18	$ 0.15	$ 0.16	$ 0.18	$ 0.17
Net earnings (loss) attributable to Century Casinos Inc. shareholders | $ / shares		(0.20)	0.31	0.07	0.09	0.12	0.08	0.09	0.09	$ 0.25	$ 0.38	$ 0.47
Diluted earnings per share:
Earnings from continuing operations | $ / shares		0.06	0.19	0.15	0.18	0.15	0.16	0.18	0.17
Net earnings (loss) attributable to Century Casinos Inc. shareholders | $ / shares		$ (0.19)	$ 0.31	$ 0.07	$ 0.09	$ 0.11	$ 0.08	$ 0.09	$ 0.09	$ 0.24	$ 0.37	$ 0.47
Income taxes (benefit)	CAD 2.2		$ 5,700							$ 4,560	$ 1,787	$ 1,654
Tax Act [Member]
Diluted earnings per share:
Income taxes (benefit)		$ 5,400								$ (300)