SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Estimated Useful Lives of Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2017
Building [Member]
Property, Plant and Equipment [Line Items]
Useful Life	39 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	Lesser of life or lease or expected useful life
Equipment and Furniture [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful Life	3 years
Equipment and Furniture [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful Life	7 years
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Useful Life	5 years
Computer Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful Life	3 years
Computer Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful Life	5 years