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EMPLOYEE BENEFIT PLANS - Funded status of Retirement Income Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CHANGE IN PLAN ASSETS:
Funded status at end of year	$ 0	$ 0
Retirement Income Plan
Defined Benefit Plan Disclosure [Line Items]
ACCUMULATED BENEFIT OBLIGATION, END OF YEAR	5,833	6,379
CHANGE IN PROJECTED BENEFIT OBLIGATION:
Benefit obligation at beginning of year	6,379	6,083
Service cost	0	0	$ 0
Interest cost	251	266	274
Actuarial loss (gain)	(554)	273
Benefits paid	(243)	(243)
Projected benefit obligation at end of year	5,833	6,379	6,083
CHANGE IN PLAN ASSETS:
Fair value of plan assets at beginning of year	6,722	6,032
Actual return on plan assets	(447)	933
Employer contributions	770	0
Benefits paid	(243)	(243)
Fair value of plan assets at end of year	6,802	6,722	6,032
Funded status at end of year	969	343
AMOUNTS RECOGNIZED IN THE CONSOLIDATED BALANCE SHEETS CONSIST OF:
Noncurrent assets	969	343
Current liabilities	0	0
Noncurrent liabilities	0	0
Amounts recognized in balance sheet, Total	969	343
AMOUNTS (PRE-TAX) RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE LOSS CONSIST OF:
Net loss	3,311	2,997
Prior service cost (credit)	0	0
Net transition obligation (asset)	0	0	$ 0
Amounts recognized in other comprehensive income before tax, Total	$ 3,311	$ 2,997

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