Segment Information (Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020		Jun. 30, 2019		Dec. 31, 2019
Segment Reporting Information [Line Items]
Net operating revenue	$ 36,103		$ 52,445		$ 123,760		$ 98,057
Earnings (loss) before income taxes	(12,615)		1,728		(55,752)		4,167
Net earnings (loss) attributable to Century Casinos, Inc. shareholders	(12,607)		(565)		(58,463)		503
Income (benefit) taxes	582		1,370		3,106		2,086
Depreciation and amortization	6,405		2,443		12,899		4,868
Net earning (loss) attributable to non-controlling interests	(590)		923		(395)		1,578
Non-cash stock-based compensation					235		621
(Gain) loss on foreign currency transactions, cost recovery income and other	(78)		(523)		(79)		(770)
Long-lived assets	491,904				491,904				$ 503,933
Cash payments related to lease					3,430		3,418
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Net operating revenue	162		1,541		1,143		3,035
United States [Member]
Segment Reporting Information [Line Items]
Net operating revenue	23,832		8,809		77,262		16,874
Canada [Member]
Segment Reporting Information [Line Items]
Net operating revenue	4,719		21,988		20,902		38,289
Poland [Member]
Segment Reporting Information [Line Items]
Net operating revenue	7,390		20,107		24,453		39,859
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net operating revenue	36,103	[1]	52,445	[2]	123,760	[1]	98,057	[1]
Earnings (loss) before income taxes	(12,615)		1,728		(55,752)		4,167
Net earnings (loss) attributable to Century Casinos, Inc. shareholders	(12,607)		(565)		(58,463)		503
Interest expense (income), net	10,579	[3]	1,393	[4]	21,944	[5]	2,647	[6]
Income (benefit) taxes	582		1,370		3,106		2,086
Depreciation and amortization	6,405		2,443		12,899		4,868
Net earning (loss) attributable to non-controlling interests	(590)		923		(395)		1,578
Non-cash stock-based compensation	249		359		236		620
(Gain) loss on foreign currency transactions, cost recovery income and other	(6,364)		(505)		28,294		(763)
(Gain) loss on disposition of fixed assets	(69)		523		(65)		567
Acquisition costs	53		768		266		768
Pre-opening expenses							538
Adjusted EBITDA	(1,762)		6,709		7,822		13,412
Operating Segments [Member] | Corporate And Other [Member]
Segment Reporting Information [Line Items]
Net operating revenue	162	[1]	1,541	[2]	1,143	[1]	3,035	[1]
Earnings (loss) before income taxes	1,609		(4,963)		(7,082)		(8,244)
Net earnings (loss) attributable to Century Casinos, Inc. shareholders	691		(4,762)		(7,599)		(7,136)
Interest expense (income), net	3,204	[3]	28	[4]	6,713	[5]	45	[6]
Income (benefit) taxes	918		(230)		517		(1,096)
Depreciation and amortization	135		141		265		439
Net earning (loss) attributable to non-controlling interests			29				(12)
Non-cash stock-based compensation	249		359		236		620
(Gain) loss on foreign currency transactions, cost recovery income and other	(7,631)		5		(6,046)		(7)
(Gain) loss on disposition of fixed assets			272		2		300
Acquisition costs	53		768		266		768
Adjusted EBITDA	(2,381)		(3,390)		(5,646)		(6,079)
Operating Segments [Member] | United States [Member]
Segment Reporting Information [Line Items]
Net operating revenue	23,832	[1]	8,809	[2]	77,262	[1]	16,874	[1]
Earnings (loss) before income taxes	(10,271)		1,642		(42,636)		2,979
Net earnings (loss) attributable to Century Casinos, Inc. shareholders	(10,271)		1,236		(43,659)		2,215
Interest expense (income), net	6,954	[3]			14,235	[5]
Income (benefit) taxes			406		1,023		764
Depreciation and amortization	4,246		527		8,505		1,086
(Gain) loss on foreign currency transactions, cost recovery income and other	1,157				30,746
(Gain) loss on disposition of fixed assets			1				17
Adjusted EBITDA	2,086		2,170		10,850		4,082
Operating Segments [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Net operating revenue	4,719	[1]	21,988	[2]	20,902	[1]	38,289	[1]
Earnings (loss) before income taxes	(1,791)		3,995		(3,960)		6,548
Net earnings (loss) attributable to Century Casinos, Inc. shareholders	(1,781)		2,536		(5,987)		4,085
Interest expense (income), net	435	[3]	1,320	[4]	979	[5]	2,511	[6]
Income (benefit) taxes	(44)		778		1,813		1,542
Depreciation and amortization	1,289		1,059		2,628		1,856
Net earning (loss) attributable to non-controlling interests	34		681		214		921
(Gain) loss on foreign currency transactions, cost recovery income and other	135		(432)		3,447		(476)
(Gain) loss on disposition of fixed assets	(69)		2		(69)		(3)
Pre-opening expenses							538
Adjusted EBITDA	(1)		5,944		3,025		10,974
Operating Segments [Member] | Poland [Member]
Segment Reporting Information [Line Items]
Net operating revenue	7,390	[1]	20,107	[2]	24,453	[1]	39,859	[1]
Earnings (loss) before income taxes	(2,162)		1,054		(2,074)		2,884
Net earnings (loss) attributable to Century Casinos, Inc. shareholders	(1,246)		425		(1,218)		1,339
Interest expense (income), net	(14)	[3]	45	[4]	17	[5]	91	[6]
Income (benefit) taxes	(292)		416		(247)		876
Depreciation and amortization	735		716		1,501		1,487
Net earning (loss) attributable to non-controlling interests	(624)		213		(609)		669
(Gain) loss on foreign currency transactions, cost recovery income and other	(25)		(78)		147		(280)
(Gain) loss on disposition of fixed assets			248		2		253
Adjusted EBITDA	(1,466)		1,985		(407)		4,435
Master Lease [Member] | United States [Member]
Segment Reporting Information [Line Items]
Interest expense (income), net	7,000				14,200
Cash payments related to lease	4,200				10,400
CDR Land Lease [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Interest expense (income), net	400		600		900		1,100
Cash payments related to lease	$ 400		$ 500		$ 900		$ 1,000

[1] Net operating revenue for Corporate and Other primarily relates to the Company’s cruise ship operations and consulting agreements.

[2] Net operating revenue for Corporate and Other primarily relates to CCB, the Company’s cruise ship operations and consulting agreements.

[3] Expense of $7.0 million related to the Master Lease is included in interest expense (income), net in the United States segment. Expense of $0.4 million related to the CDR land lease is included in interest expense (income), net in the Canada segment. Cash payments related to the Master Lease and CDR land lease were $4.2 million and $0.4 million, respectively, for the period presented.

[4] Expense of $0.6 million related to the CDR land lease is included in interest expense (income), net in the Canada segment. Cash payments related to the CDR land lease were $0.5 million for the period presented.

[5] Expense of $14.2 million related to the Master Lease is included in interest expense (income), net in the United States segment. Expense of $0.9 million related to the CDR land lease is included in interest expense (income), net in the Canada segment. Cash payments related to the Master Lease and CDR land lease were $10.4 million and $0.9 million, respectively, for the period presented.

[6] Expense of $1.1 million related to the CDR land lease is included in interest expense (income), net in the Canada segment. Cash payments related to the CDR land lease were $1.0 million for the period presented.