Basis Of Presentation and Summary of Significant Accounting Policies - Promotional Allowance (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Promotional Allowance [Line Items]
Customer Loyalty Program Liability, Current	$ 1,731,863	$ 2,102,442
Promotional allowances	32,500,000	33,000,000	21,500,000
Estimated cost of providing promotional allowances	9,100,000	9,500,000	5,700,000
Racing Segment [Member]
Promotional Allowance [Line Items]
Promotional allowances	700,000	900,000	1,000,000
TwinSpires [Member]
Promotional Allowance [Line Items]
Promotional allowances	12,500,000	12,300,000	9,300,000
Casino Segment
Promotional Allowance [Line Items]
Promotional allowances	$ 19,200,000	$ 19,800,000	$ 11,200,000