SUPPLEMENTAL EXECUTIVE RETIREMENT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Change in Benefit Obligation
Benefit obligation at the beginning of the period	$ 19,158	$ 19,745	$ 20,793	$ 21,304
Service cost	92	85	184	170
Interest cost	150	167	300	334
Payments	(12)	(12)	(1,889)	(1,823)
Benefit obligation at the end of the period	19,388	19,985	19,388	19,985
Amounts Recognized in the Consolidated Balance Sheets:
Accrued expenses and other current liabilities	1,913		1,913		$ 1,913
Other liabilities	17,474		17,474		18,880
Total accrued liabilities	19,387		19,387		$ 20,793
Estimated accumulated obligation benefit	2,700	2,300	2,700	2,300
Funded estimated accumulated obligation benefit	2,500	2,100	2,500	2,100
Unfunded estimated accumulated obligation benefit	$ 200	$ 200	$ 200	$ 200