LEASES - Additional Information (Details)	12 Months Ended
	Dec. 31, 2017 renewal_option
Operating Leased Assets [Line Items]
Initial lease terms	20 years
Minimum
Operating Leased Assets [Line Items]
Number of lease renewal terms	1
Lease renewal terms	5 years
Maximum
Operating Leased Assets [Line Items]
Lease renewal terms	10 years