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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% |  |

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