Investment In and Advances To Unconsolidated Affiliates - SHRI Joint Venture (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments	$ 17,400,000	$ 11,200,000	$ 6,300,000
Payments to acquire interest in joint venture	8,000,000	$ 25,000,000	$ 18,500,000
Saratoga Harness Racing Inc.
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			50.00%
Equity method investment, amount	$ 0
Income (loss) from equity method investments			$ (1,000,000)
Payments to acquire interest in joint venture			3,300,000
Equity method investment, impairment loss			$ 1,600,000