RETIREMENT FUND AND PROFIT SHARING PLAN, SERP (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Type [Extensible List]	us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember
SERP [Member]
Components of SERP expense [Abstract]
Service cost	$ 144	$ 183
Interest cost	185	166
Net amortization	48	111
Net periodic benefit cost	377	$ 460
Amounts recognized in accumulated other comprehensive loss, net of tax [Abstract]
Prior service cost	873		$ 918
Net loss	1,974		1,977
Total amounts recognized in accumulated other comprehensive loss	$ 2,847		$ 2,895