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RETIREMENT FUND AND PROFIT SHARING PLAN, SERP (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Type [Extensible List] | us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember |  | us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember |  |
SERP [Member] |  |  |  |  |
Components of SERP expense [Abstract] |  |  |  |  |
Service cost | $ 183 | $ 175 | $ 549 | $ 525 |
Interest cost | 166 | 168 | 498 | 505 |
Net amortization | 111 | 94 | 332 | 281 |
Net periodic benefit cost | 460 | $ 437 | 1,379 | $ 1,311 |
Amounts recognized in accumulated other comprehensive loss, net of tax [Abstract] |  |  |  |  |
Prior service cost | 943 |  | 943 |  | $ 1,135
Net loss | 3,591 |  | 3,591 |  | 3,732
Total amounts recognized in accumulated other comprehensive loss | $ 4,534 |  | $ 4,534 |  | $ 4,867

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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