GOODWILL AND INTANGIBLE ASSETS - Goodwill and Fair Value Inputs (Details) - USD ($) $ in Thousands		12 Months Ended		24 Months Ended
	Apr. 26, 2012	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016
Intangible assets
Amount of goodwill recorded		$ 25,111	$ 25,111	$ 25,111
Monarch Black Hawk
Intangible assets
Amount of goodwill recorded			25,100
Customer list | Monarch Black Hawk
Intangible assets
Total Intangible assets		10,490	10,490	10,490
Total accumulated amortization		(5,455)	(4,290)	(5,455)
Total		$ 5,035	$ 6,200	5,035
Useful life of finite-lived intangible assets	9 years
Weighted-average life		4 years 3 months 18 days	5 years 3 months 18 days
Amortization expense				$ 1,200
Fair value inputs
Attrition rate (as a percent)		24.00%
Risk-adjusted discount rate (as a percent)		12.00%