SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES - Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2018
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful live of leasehold improvements	20 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful live of leasehold improvements	39 years
Building improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful live of leasehold improvements	10 years
Building improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful live of leasehold improvements	20 years
Furniture, fixtures and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful live of leasehold improvements	3 years
Furniture, fixtures and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful live of leasehold improvements	20 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	Shorter of estimated useful life or related lease term