Common Stock and Incentive Awards (Details)			3 Months Ended	12 Months Ended		15 Months Ended
	Jan. 23, 2015 $ / shares shares	Sep. 18, 2014 USD ($) $ / shares shares	Mar. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Sep. 19, 2014 $ / shares
Stock-based compensation expense | $				$ 1,488,000
Common Stock, Shares, Issued				46,817,829	46,426,714	46,817,829
Common Stock, Shares, Outstanding				46,817,829	46,426,714	46,817,829
Unrecognized Compensation Expense | $				$ 2,400,000		$ 2,400,000
Common Stock
Authorized Common Stock				100,000,000	100,000,000	100,000,000
Par Value per share | $ / shares				$ 0.00001	$ 0.00001	$ 0.00001
Summary of Stock Option Activity
Proceeds from Stock Options Exercised | $				$ (2,125,000)	$ 245,000
Options
Outstanding at the beginning of the Period (in shares)				398,200
Exercised - in shares				0
Expired (in shares)				(86,000)
Outstanding at the end of the Period (in shares)					398,200
Range of Exercise Price
Lower end of exercise price | $ / shares					$ 2.44
Upper end of exercise price | $ / shares				$ 11.30	16.27
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share) | $ / shares				7.88
Expired (in dollars per share) | $ / shares				$ 11.30
Outstanding at the end of the period (in dollars per share) | $ / shares					$ 7.88
Weighted- Average Remaining Contractual Life (in years)					4 years 6 months 15 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value | $					$ 200,000
Summary of the RSU activity
Outstanding at the beginning of the Period (in shares)				398,200
Exercised - in shares				0
Forfeited				86,000
Outstanding at the end of the Period (in shares)					398,200
Aggregate Fair Value
Cash received from the exercise of stock options | $					$ 200,000
Restricted stock units (RSUs)
Fair Value | $ / shares	$ 4.03
Granted (in shares)	89,900
Recognition period of unrecognized compensation cost				2 years 1 month 13 days
Options
Outstanding at the beginning of the Period (in shares)			827,383
Granted (in shares)				917,283
Vested (in shares)				89,900
Outstanding at the end of the Period (in shares)				827,383		827,383
Weighted-Average Exercise Price
Granted (in dollars per share) | $ / shares				$ 4.08
Vested (in dollars per share) | $ / shares				4.03
Outstanding at the end of the period ( in dollars per share) | $ / shares				$ 4.09		$ 4.09
Weighted- Average Remaining Contractual Life (in years)				2 years 1 month 13 days
Aggregate Intrinsic Value
Aggregate fair value | $				$ 3,400,000
Summary of the RSU activity
Outstanding at the beginning of the Period (in shares)			827,383
Granted (in shares)				917,283
Outstanding at the end of the Period (in shares)				827,383		827,383
Weighted Average Grant Date Fair Value
Unvested outstanding as of beginning of period | $ / shares			$ 4.09
Granted | $ / shares	$ 4.03
Outstanding at the end of the period ( in dollars per share) | $ / shares				$ 4.09		$ 4.09
Restricted stock units (RSUs) | Plan 2015 Member
Granted (in shares)				9,171
RSU And Performance Awards
Fair Value | $ / shares	$ 4.03
Granted (in shares)	685,606
Weighted Average Grant Date Fair Value
Granted | $ / shares	$ 4.03
Stock options.
Options
Outstanding at the beginning of the Period (in shares)			312,200			474,833
Exercised - in shares						(76,633)
Outstanding at the end of the Period (in shares)				312,200		312,200
Weighted-Average Exercise Price
Exercised (in dollars per share) | $ / shares						$ 3.22
Outstanding at the end of the period (in dollars per share) | $ / shares		$ 7.13
Outstanding and Exercisable (in dollars per share) | $ / shares				$ 6.94		$ 6.94
Weighted- Average Remaining Contractual Life (in years)				3 years 5 months 19 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value | $				$ 1,300,000
Summary of the RSU activity
Outstanding at the beginning of the Period (in shares)			312,200			474,833
Exercised - in shares						(76,633)
Outstanding at the end of the Period (in shares)				312,200		312,200
Performance Awards
Percentage of target to be achieved to be eligible to receive performance awards				135.00
Options
Granted (in shares)				475,409
Summary of the RSU activity
Granted (in shares)				475,409
Common Stock Member
Common Stock
Par Value per share | $ / shares							$ 0.00001
MTR Gaming 2010 Long Term Incentive Plan
Right to receive per share | $		$ 6.05
Converted to a right to receive $ 6.05 per share
Number of shares converted		5,785,123
Converted to a right to receive one share of ERI Stock
Number of shares converted		22,600,961
Number of shares granted on conversion (per share)		1
Outstanding as of beginning
Range of Exercise Price
Lower end of exercise price | $ / shares		$ 2.44
Upper end of exercise price | $ / shares		$ 16.27
Exercised
Range of Exercise Price
Lower end of exercise price | $ / shares				$ 2.44
Upper end of exercise price | $ / shares						$ 3.94
Outstanding as of the end
Range of Exercise Price
Lower end of exercise price | $ / shares				2.44
Upper end of exercise price | $ / shares				$ 16.27
Ex Executive Officer
Severance Costs | $			$ 800,000
Ex Executive Officer | Restricted stock units (RSUs)
Stock-based compensation expense | $			$ 300,000
Summary of the RSU activity
Vested			75,516