EMPLOYEE BENEFIT PLANS - Net Periodic Pension Cost (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Employee Benefit Plans
Annual benefits accrued to participants under the plan	$ 0
Number of new employees eligible under the plan | item	0
Pension expenses	$ 12,000	$ 25,000	$ 74,000
Objective minimum average total rate of return above the rate of inflation (as a percent)	4.00%
Equity Securities [Member]
Employee Benefit Plans
Maximum equity exposure as a percentage of total portfolio value	75.00%
Actual rate of return assumed for equities (as a percent)	10.00%
Fixed Income Securities [Member]
Employee Benefit Plans
Actual rate of return assumed for fixed income (as a percent)	4.00%