Acquisitions (Narrative) (Details) $ in Thousands, CAD in Millions				3 Months Ended								12 Months Ended
	Oct. 31, 2016 USD ($)	Oct. 01, 2016 CAD	Oct. 01, 2016 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Business Acquisition [Line Items]
Total consideration		CAD 31.9	$ 24,300
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
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
Assets				274,876				217,838				274,876	217,838
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows				76,444				39,020				76,444	39,020	$ 29,568	$ 25,317	$ 25,317
Liabilities				87,558				79,254				87,558	79,254
Apex Acquisition[Member]
Business Acquisition [Line Items]
Additional ownership acquired			100.00%
Net operating revenue												8,800	2,000
Net earnings (loss) attributable to Century Casinos, Inc. shareholders												1,100	300
Assets			$ 22,400
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows			3,100
Liabilities			$ 1,700
Goodwill				$ 3,600								$ 3,600
Investment fair value	$ 21,200
Acquisition costs								$ 200					$ 200