Intangible Assets (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) item	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Intangible assets
Indefinite-life intangible assets	$ 433,005		$ 433,005		$ 375,405
Other intangible assets, Gross Carrying Value	135,555		135,555		131,483
Other intangible assets, Accumulated Amortization	95,592		95,592		84,282
Total	39,963		39,963		47,201
Total intangible assets, Gross Carrying Value	568,560		568,560		506,888
Total intangible assets, Net Book Value	472,968		472,968		$ 422,606
Increase in other intangible assets during the period			$ 50,400
Number of Category 4 gaming licenses purchased | item			2
Intangible asset amortization expense	$ 3,300	$ 4,300	$ 11,900	$ 14,800
Weighted average remaining amortization period			4 years 2 months 12 days
York County
Intangible assets
Payment for Category 4 licenses			$ 50,100
Berks and Lancaster Counties
Intangible assets
Payment for Category 4 licenses			$ 7,500
Maximum
Intangible assets
Number of slot machines in Category 4 facility | item			750
Number of table games in Category 4 facility | item			30