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RETIREMENT FUND AND PROFIT SHARING PLAN, SERP, Obligations and Funded Status (Details) - SERP [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Change in fair value of plan assets [Roll Forward] |  |
Fair value of plan assets, beginning of period | $ 0 | $ 0
Company contributions | 325 | 240
Benefits paid | (325) | (240)
Fair value of plan assets, end of period | 0 | 0
Change in benefit obligation [Roll Forward] |  |
Benefit obligation, beginning of period | 19,134 | 16,900
Service cost | 732 | 700
Interest cost | 664 | 673
Benefits paid | (325) | (240)
Plan amendments | 39 | 198
Actuarial (gains) losses | (1,568) | 903
Benefit obligation, end of period | 18,676 | 19,134
Funded (unfunded) status of plan [Abstract] |  |
Underfunded status, December 31 | (18,676) | (19,134)
Other disclosures [Abstract] |  |
Accumulated benefit obligation | 16,500 | 16,100
Fair value of life insurance policies and marketable securities held in a rabbi trust | 13,000 | 14,000
Estimated net loss and prior service cost that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year | 200 |
Expected employer contributions in next fiscal year | 300 |
Expected future benefit payments [Abstract] |  |
2019 | 379 |
2020 | 659 |
2021 | 679 |
2022 | 902 |
2023 | 941 |
2024 - 2028 | 5,409 |
Amounts recognized in accumulated other comprehensive loss, pretax [Abstract] |  |
Prior service cost | 918 | 1,135
Net loss | 1,977 | 3,732
Total amounts recognized in accumulated other comprehensive loss | $ 2,895 | $ 4,867

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