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Acquisitions and Divestitures Asset Acquisition - Valley Forge (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 17, 2018	Dec. 31, 2015
Business Acquisition [Line Items]
Revenues	$ 791,623		$ 612,196	$ 616,793	$ 606,118	$ 595,088	$ 591,542	$ 604,124	$ 610,065	$ 2,626,730	$ 2,400,819	$ 2,199,259
Project development, preopening and writedowns										45,698	14,454	22,107
Goodwill	1,062,102	$ 1,062,102				888,224				1,062,102	888,224	826,476		$ 685,310
Net Income (Loss) Attributable to Parent	$ 22,867		$ 11,837	$ 38,945	$ 41,399	$ 82,073	$ 23,157	$ 48,709	$ 35,451	115,048	189,390	$ 420,231
Valley Forge Convention Center Partners, L.P. [Domain]
Business Acquisition [Line Items]
Revenues		43,499
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land													$ 15,200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets													29,909
Business Combination, Assets and Liabilities Arising from Contingencies, Amount Recognized, Net													266,600
Project development, preopening and writedowns										$ 3,600	$ 400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment													56,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets													483
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill													148,600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets													235,492
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities													12,968
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities													606
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities													13,574
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net													221,918
Goodwill													69,446
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net													291,364
Net Income (Loss) Attributable to Parent		$ 4,450
As Previously Reported [Member] | Valley Forge Convention Center Partners, L.P. [Domain]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets													29,909
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment													47,762
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets													483
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill													0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets													78,154
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities													12,028
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities													606
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities													12,634
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net													65,520
Goodwill													225,844
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net													291,364
Adjustments [Member] | Valley Forge Convention Center Partners, L.P. [Domain]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets													0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment													8,738
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets													0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill													148,600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets													157,338
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities													940
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities													0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities													940
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net													156,398
Goodwill													(156,398)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net													0
Building and Improvements | Valley Forge Convention Center Partners, L.P. [Domain]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment													32,900
Furniture and Fixtures [Member] | Valley Forge Convention Center Partners, L.P. [Domain]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment													7,971
Construction in Progress [Member] | Valley Forge Convention Center Partners, L.P. [Domain]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, CIP													429
Customer Relationships | Valley Forge Convention Center Partners, L.P. [Domain]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life										5 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill													15,100
Trademarks | Valley Forge Convention Center Partners, L.P. [Domain]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill													12,500
Gaming License Rights | Valley Forge Convention Center Partners, L.P. [Domain]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill													$ 121,000

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