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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Change in Accounting Estimate (Details) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended		12 Months Ended	15 Months Ended	18 Months Ended
	Dec. 31, 2013 USD ($)	Oct. 31, 2015 USD ($)	Mar. 31, 2016 USD ($) item $ / shares	Mar. 31, 2015 USD ($) $ / shares	Dec. 31, 2014 USD ($)	Mar. 31, 2015	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jul. 31, 2014 USD ($)
Change in Accounting Estimate
Net book value			$ 208,617				$ 203,154
Net income			$ 4,575	$ 4,043
SEGMENT INFORMATION
Number of operating segments | item			2
Number of reportable segments | item			1
Monarch Black Hawk Parking Structure
Change in Accounting Estimate
Net book value	$ 4,800
Estimated depreciable life	P37Y
Monarch Black Hawk Parking Structure | Service Life
Change in Accounting Estimate
Net book value								$ 400	$ 2,900
Estimated depreciable life						P15M	P18M
Depreciation expense per month		$ 40			$ 300
Depreciation expense net of tax per month					$ 200
Depreciation expense			$ 133	451
Net income			$ (87)	$ (293)
Basic and diluted earnings per share (in dollars per share) | $ / shares			$ (0.01)	$ (0.02)

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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.

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