PROPERTY AND EQUIPMENT - Schedule of asset acquisition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Building
Property and Equipment
Depreciation period	34 years
Two Office Buildings In Charlotte, NC
Property and Equipment
Land		$ 5,818
Building		14,679
Site improvements		950
Tenant leases		2,029
Fixed assets		$ 23,476
Weighted Average Amortization Life		3 years 2 months 10 days
Two Office Buildings In Charlotte, NC | Building | Weighted Average
Property and Equipment
Depreciation period		34 years
Two Office Buildings In Charlotte, NC | Site improvements | Weighted Average
Property and Equipment
Depreciation period		6 years 7 months 10 days