Segment Information - Equity in Earnings of Unconsolidated Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting, Other Significant Reconciling Item [Line Items]
Equity in gains of unconsolidated investments	$ 2,389	$ 1,057	$ 8,244	$ 5,853
Casino Segment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Equity in gains of unconsolidated investments	2,337	1,839	7,754	6,676
TwinSpires [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Equity in gains of unconsolidated investments	0	(289)	0	(41)
Other Investments Segment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Equity in gains of unconsolidated investments	$ 52	$ (493)	$ 490	$ (782)