Summary of Significant Accounting Policies - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Information
Impact to income from operations	$ 134,989	$ 149,337	$ 275,276	$ 289,868
Kansas Entertainment
Segment Information
Ownership interest in joint venture (as a percent)	50.00%		50.00%
Penn Interactive Ventures
Segment Information
Percent of net revenue			1.40%
Impact to income from operations			$ (2,300)
Percent of total assets	2.20%		2.20%