Summary of Significant Accounting Policies - Concentration of Credit Risk and Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts	$ (3,161)	$ (2,983)
Receivables, net	106,837	62,805
Markers issued to customers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	17,242	5,237
Cash, credit card, and other advances to customers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	20,925	13,891
Receivables from automatic teller machine and cash kiosk transactions
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	19,244	2,785
Hotel and banquet receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	8,142	4,566
Receivables due from the West Virginia Lottery
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	4,358	6,088
Racing settlements
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	6,064	5,493
Reimbursement of payroll expenses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	3,439	3,366
Receivables due from platform providers for social casino game revenues
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	2,255	3,019
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	$ 28,329	$ 21,343

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