Fair Value Measurements (Details) - USD ($) $ in Thousands		1 Months Ended		3 Months Ended	12 Months Ended
	Aug. 01, 2016	Sep. 30, 2017	Aug. 31, 2015	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair value of assets and liabilities
Decrease in contingent purchase price obligation					$ 6,840	$ (1,277)	$ 5,374
Total Reduction in Fair Value Recorded during the year
Goodwill impairment losses					(18,026)	0	0
Goodwill acquired					36,598	77,743
Rocket Speed and Plainridge Racecourse | General and administrative expenses
Fair value of assets and liabilities
Change in fair value in long term obligation, credit (charge) to general and administrative expense					$ (6,800)	1,300
Rocket Speed
Fair value of assets and liabilities
Period of contingent obligation	2 years			2 years
Rocket Speed | General and administrative expenses
Financial liabilities:
Benefit resulting from the buy out of contingent purchase price consideration				$ 22,200
Plainridge Racecourse
Fair value of assets and liabilities
Period of contingent obligation					10 years
Plainridge Racecourse | General and administrative expenses
Fair value of assets and liabilities
Change in fair value in long term obligation, credit (charge) to general and administrative expense					$ (12,500)	1,300	5,400
Tropicana Las Vegas
Total Reduction in Fair Value Recorded during the year
Deferred tax assets not recorded at acquisition date due to full valuation allowance			$ 68,000
Goodwill acquired			$ 14,800
Contingent Purchase Price
Financial liabilities:
Balance at beginning of the period					48,244	13,815	19,189
Additions					905	34,945
Payments					(19,613)	(1,793)
Included in earnings					6,840	1,277	(5,374)
Balance at end of the period					$ 22,696	48,244	$ 13,815
Contingent Purchase Price | Discounted Cash Flow | Plainridge Racecourse
Fair value of assets and liabilities
Discount Rate					8.30%
Level 1
Fair value of assets and liabilities
Cash and cash equivalents					$ 277,953	229,510
Level 3
Fair value of assets and liabilities
Loans to Jamul Tribe					16,533	98,000
Financial liabilities:
Long-term debt					$ 22,696	48,244
Level 3 | Loans to the Jamul Tribe
Fair value of assets and liabilities
Discount Rate					14.00%
Senior Secured Credit Facility | Level 1
Financial liabilities:
Long-term debt					$ 760,456	785,092
Senior Secured Credit Facility | Level 2
Financial liabilities:
Long-term debt						191,000
Senior Unsecured Notes | Level 1
Financial liabilities:
Long-term debt					412,000	312,000
Other long-term obligations | Level 2
Financial liabilities:
Long-term debt					113,460	152,132
Nonrecurring
Total Reduction in Fair Value Recorded during the year
Goodwill impairment losses						(18,026)
Nonrecurring | Level 3
Assets measured at fair value
Goodwill						598
Carrying Amount
Fair value of assets and liabilities
Cash and cash equivalents					277,953	229,510
Loans to Jamul Tribe					20,900	92,100
Financial liabilities:
Long-term debt					22,696	48,244
Carrying Amount | Senior Secured Credit Facility
Financial liabilities:
Long-term debt					730,787	962,703
Carrying Amount | Senior Unsecured Notes
Financial liabilities:
Long-term debt					399,249	296,895
Carrying Amount | Other long-term obligations
Financial liabilities:
Long-term debt					119,310	154,084
Fair Value
Fair value of assets and liabilities
Cash and cash equivalents					277,953	229,510
Loans to Jamul Tribe					16,533	98,000
Financial liabilities:
Long-term debt					22,696	48,244
Fair Value | Senior Secured Credit Facility
Financial liabilities:
Long-term debt					760,456	976,092
Fair Value | Senior Unsecured Notes
Financial liabilities:
Long-term debt					412,000	312,000
Fair Value | Other long-term obligations
Financial liabilities:
Long-term debt					113,460	152,132
Fair Value | Nonrecurring
Assets measured at fair value
Goodwill						$ 598
South/West | Tropicana Las Vegas
Total Reduction in Fair Value Recorded during the year
Goodwill impairment losses		$ (14,800)			(14,800)
Other | Sanford Orlando Kennel Club
Total Reduction in Fair Value Recorded during the year
Goodwill impairment losses		$ (3,200)			$ (3,200)