Segment Information - Equity in Earnings of Unconsolidated Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting, Other Significant Reconciling Item [Line Items]
Equity in gains of unconsolidated investments	$ 2,907	$ 2,506	$ 5,855	$ 4,796
Casino Segment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Equity in gains of unconsolidated investments	2,859	2,796	5,417	4,837
TwinSpires [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Equity in gains of unconsolidated investments	0	28	0	248
Other Investments Segment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Equity in gains of unconsolidated investments	$ 48	$ (318)	$ 438	$ (289)