Segment Information (Segment Information) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) item	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) item	Sep. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Net operating revenue	$ 43,564	$ 41,048	$ 123,834	$ 114,775
Earnings (loss) before income taxes	2,586	4,039	4,999	10,867
Net earnings (loss) attributable to Century Casinos, Inc. shareholders	1,640	7,630	2,887	11,592
Interest expense (income), net	830	808	2,916	2,598
Income taxes (benefit)	791	(3,913)	1,784	(2,054)
Depreciation and amortization	2,323	2,226	6,645	6,330
Net earnings (loss) attributable to non-controlling interests	155	322	328	1,329
Non-cash stock-based compensation	266	183	613	419
(Gain) loss on foreign currency transactions, cost recovery income	(182)	(70)	(431)	(555)
Loss on disposition of fixed assets	172	85	1,035	340
Acquisition costs		169		349
Pre-opening expenses	446	107	1,890	332
Other one-time income	(91)		(91)
Adjusted EBITDA	$ 6,350	7,547	$ 17,576	20,680
Number of Co-CEOs | item	2		2
Number of reportable segments | item			3
Canada [Member]
Segment Reporting Information [Line Items]
Net operating revenue	$ 15,683	15,285	$ 45,690	42,484
Earnings (loss) before income taxes	2,766	3,096	8,288	7,971
Net earnings (loss) attributable to Century Casinos, Inc. shareholders	1,668	2,611	5,641	5,923
Interest expense (income), net	854	759	2,812	2,544
Income taxes (benefit)	880	392	2,101	1,707
Depreciation and amortization	762	877	2,433	2,529
Net earnings (loss) attributable to non-controlling interests	218	93	546	341
(Gain) loss on foreign currency transactions, cost recovery income	(1)	50	(140)	78
Loss on disposition of fixed assets	3	68	6	78
Acquisition costs				28
Pre-opening expenses	446	10	1,135	10
Adjusted EBITDA	4,830	4,860	14,534	13,238
United States [Member]
Segment Reporting Information [Line Items]
Net operating revenue	9,360	9,039	25,542	24,482
Earnings (loss) before income taxes	2,121	2,056	4,844	4,559
Net earnings (loss) attributable to Century Casinos, Inc. shareholders	1,578	1,276	3,602	2,827
Interest expense (income), net			1	1
Income taxes (benefit)	543	780	1,242	1,732
Depreciation and amortization	545	596	1,631	1,824
Loss on disposition of fixed assets		1	1	1
Adjusted EBITDA	2,666	2,653	6,477	6,385
Poland [Member]
Segment Reporting Information [Line Items]
Net operating revenue	16,747	15,550	48,695	44,383
Earnings (loss) before income taxes	83	959	(177)	3,848
Net earnings (loss) attributable to Century Casinos, Inc. shareholders	(81)	464	(329)	1,982
Interest expense (income), net	42	56	153	72
Income taxes (benefit)	204	266	316	878
Depreciation and amortization	717	657	2,040	1,702
Net earnings (loss) attributable to non-controlling interests	(40)	229	(164)	988
(Gain) loss on foreign currency transactions, cost recovery income	(109)	(222)	(290)	(685)
Loss on disposition of fixed assets	169	16	1,027	258
Pre-opening expenses			405	225
Adjusted EBITDA	902	1,466	3,158	5,420
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net operating revenue	1,774	1,174	3,907	3,426
Earnings (loss) before income taxes	(2,384)	(2,072)	(7,956)	(5,511)
Net earnings (loss) attributable to Century Casinos, Inc. shareholders	(1,525)	3,279	(6,027)	860
Interest expense (income), net	(66)	(7)	(50)	(19)
Income taxes (benefit)	(836)	(5,351)	(1,875)	(6,371)
Depreciation and amortization	299	96	541	275
Net earnings (loss) attributable to non-controlling interests	(23)		(54)
Non-cash stock-based compensation	266	183	613	419
(Gain) loss on foreign currency transactions, cost recovery income	(72)	102	(1)	52
Loss on disposition of fixed assets			1	3
Acquisition costs		169		321
Pre-opening expenses		97	350	97
Other one-time income	(91)		(91)
Adjusted EBITDA	$ (2,048)	$ (1,432)	$ (6,593)	$ (4,363)