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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended 36 Months Ended
Apr. 26, 2012
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Intangible assets        
Amount of goodwill recorded   $ 25,111 $ 25,111 $ 25,111
Monarch Black Hawk        
Intangible assets        
Amount of goodwill recorded   25,100   25,100
Total intangible assets   12,080 12,080 12,080
Total accumulated amortization   (5,880) (4,714) (5,880)
Intangible assets, net   $ 6,200 $ 7,366 6,200
Weighted-average life   5 years 3 months 18 days 6 years 3 months 18 days  
Amortization expense   $ 1,200 $ 1,200  
Estimated amortization expense        
2015   1,165   1,165
2016   1,165   1,165
2017   1,165   1,165
2018   1,165   1,165
2019   1,165   1,165
Thereafter   375   375
Intangible assets, net   6,200 7,366 6,200
Fair value inputs        
Decrease in goodwill upon completion of the purchase price allocation related primarily to modification to the value of certain deferred tax assets     1,400  
Changes to carrying amount of goodwill       0
Customer list | Monarch Black Hawk        
Intangible assets        
Total intangible assets   10,490 10,490 10,490
Total accumulated amortization   $ (4,290) (3,124) (4,290)
Useful life of finite-lived intangible assets 9 years      
Fair value inputs        
Attrition rate (as a percent)   24.00%    
Risk-adjusted discount rate (as a percent)   12.00%    
Trade Name | Monarch Black Hawk        
Intangible assets        
Total intangible assets   $ 1,590 1,590 1,590
Total accumulated amortization   $ (1,590) $ (1,590) $ (1,590)
Fair value inputs        
Risk-adjusted discount rate (as a percent)   11.00%    
Royalty rate (as a percent)   1.00%