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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Change in Accounting Estimate and Goodwill (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended			15 Months Ended	18 Months Ended
	Oct. 31, 2015	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2015	Dec. 31, 2015	Jul. 31, 2014
Change in Accounting Estimate
Net book value		$ 203,154				$ 180,271				$ 203,154	$ 180,271			$ 203,154
Net income		5,123	$ 6,394	$ 5,099	$ 4,043	3,811	$ 4,074	$ 3,024	$ 3,276	20,659	14,185	$ 17,961
Amount of goodwill recorded		25,111				$ 25,111				25,111	25,111			25,111
Monarch Black Hawk
Change in Accounting Estimate
Amount of goodwill recorded		$ 25,100								25,100				$ 25,100
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										1,400	2,900
Net income										$ (900)	$ (1,900)
Basic and diluted earnings per share (in dollars per share)										$ (0.05)	$ (0.11)

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Section 45
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