Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 25, 2016	Feb. 28, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]
Operating Lease, Right-of-Use Asset			$ 63,000		$ 63,000		$ 65,000
Restricted cash for Development Projects				$ 64,178		$ 64,178		$ 21,039
Restricted cash for Development Projects			0		0			21,039
Customer Loyalty Program Liability, Current			3,500		3,500			2,200
Other Deferred Compensation Arrangements, Liability, Classified, Noncurrent			2,000		2,000			2,300
Gaming Facility License Term						10 years
Allowance for doubtful accounts			300		300			$ 200
Interest charges capitalized			$ 300	$ 300	$ 600	$ 11,700
Common stock, shares issued (shares)			34,435,907		34,435,907			34,403,250
Total unrecognized compensation			$ 2,300		$ 2,300
Vesting period for unrecognized compensation cost to be recognized (in years)					2 years 6 months
Accumulated other comprehensive loss			99		$ 99			$ 219
Retained Earnings (Accumulated Deficit)			540,069		540,069			439,910
Operating Lease, Liability			74,518		74,518		$ 74,700
Montreign [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Gaming Facility License Fee	$ 51,000
Term Loan Facility, Term B Loan [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash for Development Projects			0		0			21,000
Payments of Debt Restructuring Costs		$ 675	102
Other Assets, Fair Value Disclosure			3		3			143
Initial Put Option [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Derivative Liability			1,100		1,100			900
New York State Racing, Pari-Mutual Wagering And Breeding Law [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted Cash and Cash Equivalents			$ 1,000		1,000			$ 400
License [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Amortization					$ 6,300
Finite-Lived Intangible Assets, Remaining Amortization Period					7 years