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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Change in Accounting Estimate (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2014 | Dec. 31, 2013 | Oct. 31, 2015 | Jul. 31, 2014 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net book value |  |  |  |  | $ 250,714 |  |  |  | $ 214,899 |  |  |  | $ 250,714 | $ 214,899 |  |
Net income |  |  |  |  | $ 4,397 | $ 9,030 | $ 7,239 | $ 4,872 | $ 6,470 | $ 7,834 | $ 5,695 | $ 4,575 | $ 25,538 | 24,574 | $ 20,659 |
Land improvements | Monarch Casino Black Hawk parking facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net book value |  | $ 4,800 |  | $ 2,900 |  |  |  |  |  |  |  |  |  |  |  | $ 400
Estimated depreciable life |  | P37Y |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land improvements | Monarch Casino Black Hawk parking facility | Service Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated depreciable life | P15M |  |  | P18M |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense per month | $ 300 |  | $ 40 |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense net of tax per month | $ 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 300 | 1,400 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (200) | $ (900) |
Basic and diluted earnings per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.01) | $ 0.05 |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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