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Investments in and Advances to Unconsolidated Affiliates - Additional Information (Details) $ in Thousands, shares in Millions	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2018	Apr. 30, 2018 USD ($) a	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) a	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) a	Jan. 31, 2019 shares	Jan. 29, 2019 USD ($)
Investment in Unconsolidated Affiliates
Receivable from partnership			$ 585		$ 585		$ 3,806
Investments in and advance to affiliates, subsidiaries, associates, and joint ventures			134,939		134,939		$ 135,828
Unrealized loss on investments			12,806	$ (1,398)	$ (10,202)	$ (2,858)
Pompano Joint Venture
Investment in Unconsolidated Affiliates
Cash contributions in joint venture		$ 1,000
Land \| a					20		20
Fair value of land			6,600		$ 6,600		$ 6,600
Variable interest entity, ownership percentage		50.00%
Pompano Joint Venture \| Maximum
Investment in Unconsolidated Affiliates
Land \| a		200
Pompano Joint Venture \| Minimum
Investment in Unconsolidated Affiliates
Land \| a		130
William Hill
Investment in Unconsolidated Affiliates
Agreement period	25 years
Percentage of equity stake								20.00%
Equity stake value in ordinary shares \| shares								13.4
Receivable from partnership			$ 400		400		3,500
Recognizing revenue on straight-line basis over a period			25 years
Recognized revenue			$ 3,700	1,500	5,200	2,600
William Hill \| Other Long Term Liabilities
Investment in Unconsolidated Affiliates
Deferred revenue			136,900		136,900		142,100
William Hill US
Investment in Unconsolidated Affiliates
Fair value of initial investment									$ 128,900
Investments in and advance to affiliates, subsidiaries, associates, and joint ventures			125,700		125,700		127,100
William Hill PLC
Investment in Unconsolidated Affiliates
Fair value of restricted investments			16,600		16,600		29,300
Cumulative unrealized loss					10,700
Cumulative unrealized gain							$ 2,000
Unrealized loss on investments			$ 6,600	$ (1,500)	$ (12,700)	$ (4,400)