Intangible Assets (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) item	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Intangible assets
Indefinite-life intangible assets	$ 433,005		$ 433,005		$ 375,405
Other intangible assets, Gross Carrying Value	135,195		135,195		131,483
Other intangible assets, Accumulated Amortization	92,883		92,883		84,282
Finite-lived intangible assets, Net Book Value	42,312		42,312		47,201
Total intangible assets, Gross Carrying Value	568,200		568,200		506,888
Total intangible assets, Net Book Value	475,317		475,317		$ 422,606
Increase in other intangible assets during the period			$ 52,700
Number of Category 4 gaming licenses purchased | item			2
Intangible asset amortization expense	$ 4,100	$ 5,300	$ 8,600	$ 10,500
Weighted average remaining amortization period			4 years 4 months 24 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