Unaudited Summarized Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended											12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	[1]	Mar. 31, 2018	Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net operating revenue	$ 45,106	$ 43,564	$ 39,648		$ 40,620	$ 39,293	[2]	$ 41,048	[3]	$ 37,330	$ 36,398	$ 168,938	$ 154,069	$ 139,234
Earnings from operations	1,976	3,234	996		3,251	1,706	[2]	4,777	[3]	3,641	4,490	9,459	14,615	16,165
Net earnings (loss)	790	1,795	97		1,319	(5,030)	[2]	7,952	[3]	2,170	2,797	4,006	7,891	13,813
Net earnings (loss) attributable to Century Casinos, Inc. shareholders	$ 506	$ 1,640	$ 317		$ 926	$ (5,334)	[2]	$ 7,630	[3]	$ 1,802	$ 2,159	$ 3,394	$ 6,259	$ 9,215
Basic earnings per share:
Earnings from operations	$ 0.07	$ 0.11	$ 0.03		$ 0.11	$ 0.07	[2]	$ 0.20	[3]	$ 0.15	$ 0.18
Net earnings (loss) attributable to Century Casinos Inc. shareholders	0.02	0.06	0.01		0.03	(0.20)	[2]	0.31	[3]	0.07	0.09	$ 0.12	$ 0.25	$ 0.38
Diluted earnings per share:
Earnings from operations	0.07	0.11	0.03		0.11	0.06	[2]	0.19	[3]	0.15	0.18
Net earnings (loss) attributable to Century Casinos Inc. shareholders	$ 0.02	$ 0.05	$ 0.01		$ 0.03	$ (0.19)	[2]	$ 0.31	[3]	$ 0.07	$ 0.09	$ 0.11	$ 0.24	$ 0.37
Valuation allowance								$ 5,700
Income taxes (benefit)												$ 1,917	$ 4,560	$ 1,787
Tax Act [Member]
Diluted earnings per share:
Income taxes (benefit)						$ 5,400							$ 300

[1] CCB began operating in May 2018.

[2] The Company recognized tax expense of $5.4 million related to the Tax Act, increasing net loss and net loss attributable to Century Casinos, Inc. shareholders by the same amount.

[3] The Company released a $5.7 million US valuation allowance on its US deferred tax assets, resulting in a tax benefit and increasing net earnings and net earnings attributable to Century Casinos, Inc. shareholders by the same amount.