RETIREMENT FUND AND PROFIT SHARING PLAN (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Defined Contribution Plan Disclosure [Line Items] |
|
|
|
| Employer match of the first 1% of compensation contributed by participants |
100.00%
|
|
|
| Percentage of participant contribution under condition one |
1.00%
|
|
|
| Employer match of the next 5% compensation contributed by participants, percentage |
50.00%
|
|
|
| Percentage of employee deferrals under condition two |
5.00%
|
|
|
| Employer matching contribution, percentage |
7.00%
|
|
|
| Minimum [Member] |
|
|
|
| Defined Contribution Plan Disclosure [Line Items] |
|
|
|
| Employer matching contribution, percentage |
5.00%
|
|
|
| Maximum [Member] |
|
|
|
| Defined Contribution Plan Disclosure [Line Items] |
|
|
|
| Employee matching contribution per participant under prior plan |
5.00%
|
|
|
| Common Class A [Member] |
|
|
|
| Defined Contribution Plan Disclosure [Line Items] |
|
|
|
| Shares owned by plan (in shares) |
13,637
|
|
|
| Common Class B [Member] |
|
|
|
| Defined Contribution Plan Disclosure [Line Items] |
|
|
|
| Shares owned by plan (in shares) |
159,688
|
|
|
| Retirement Fund [Member] |
|
|
|
| Defined Contribution Plan Disclosure [Line Items] |
|
|
|
| Compensation expenses |
$ 300
|
$ 300
|
$ 300
|
| Retirement Fund [Member] | Common Class A [Member] |
|
|
|
| Defined Contribution Plan Disclosure [Line Items] |
|
|
|
| Shares owned by plan (in shares) |
3,323
|
|
|
| Retirement Fund [Member] | Common Class B [Member] |
|
|
|
| Defined Contribution Plan Disclosure [Line Items] |
|
|
|
| Shares owned by plan (in shares) |
17,342
|
|
|
| 401K Plan [Member] |
|
|
|
| Defined Contribution Plan Disclosure [Line Items] |
|
|
|
| Compensation expenses |
$ 1,100
|
1,200
|
800
|
| SERP [Member] |
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
| Pension expense |
$ 1,600
|
1,500
|
1,300
|
| Normal retirement age |
65 years
|
|
|
| Number of years of service |
20 years
|
|
|
| Number of years of plan participation |
5 years
|
|
|
| Percentage of average base compensation payable as normal retirement benefit under the plan |
40.00%
|
|
|
| Early retirement age |
55 years
|
|
|
| Number of consecutive calendar years of plan participation to calculate average base compensation |
20 years
|
|
|
| Number of monthly payments under the death benefit of the plan |
120 months
|
|
|
| Period for which beneficiary is entitled to receive benefit |
shorter of (i) the time necessary to complete 120 monthly payments or (ii) 60 months
|
|
|
| Percentage of participant's annual base salary received by beneficiary for one year from date of death |
100.00%
|
|
|
| Period for which beneficiary will receive hundred percent annual base salary |
1 year
|
|
|
| Percentage of participant's annual base salary received by beneficiary for years two through five following date of death |
50.00%
|
|
|
| Period for which beneficiary will receive fifty percent annual base salary |
4 years
|
|
|
| Components of SERP expense [Abstract] |
|
|
|
| Service Cost |
$ 593
|
552
|
542
|
| Interest Cost |
659
|
567
|
541
|
| Net amortization |
391
|
366
|
182
|
| Net periodic benefit cost |
1,643
|
1,485
|
1,265
|
| Summary of information about changes in plan assets, benefit obligation, and the funded status [Abstract] |
|
|
|
| Fair value of plan assets, beginning of period |
0
|
0
|
|
| Company contributions |
129
|
85
|
|
| Benefits paid |
(129)
|
(85)
|
|
| Fair value of plan assets, end of period |
0
|
0
|
0
|
| Benefit obligation January 1 |
15,576
|
14,205
|
|
| Service cost |
593
|
552
|
542
|
| Interest cost |
659
|
567
|
541
|
| Benefits paid |
(129)
|
(85)
|
|
| Plan amendments |
487
|
0
|
|
| Actuarial (gains) losses |
(286)
|
337
|
|
| Benefit obligation, December 31 |
16,900
|
15,576
|
$ 14,205
|
| Underfunded status, December 31 |
(16,900)
|
(15,576)
|
|
| Accumulated benefit obligation |
13,800
|
12,700
|
|
| Fair value of life insurance policies and marketable securities held in a rabbi trust |
12,700
|
12,200
|
|
| 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 |
400
|
|
|
| Expected employer contributions in next fiscal year |
100
|
|
|
| Expected future benefit payments [Abstract] |
|
|
|
| 2017 |
129
|
|
|
| 2018 |
288
|
|
|
| 2019 |
543
|
|
|
| 2020 |
658
|
|
|
| 2021 |
658
|
|
|
| 2022 - 2026 |
5,160
|
|
|
| Amounts recognized in accumulated other comprehensive loss, pretax [Abstract] |
|
|
|
| Prior service cost |
1,172
|
866
|
|
| Net loss |
2,970
|
3,465
|
|
| Total amounts recognized in accumulated other comprehensive loss |
$ 4,142
|
$ 4,331
|
|
| Net periodic benefit cost [Abstract] |
|
|
|
| Discount rate |
4.25%
|
4.00%
|
5.00%
|
| Rate of compensation increase |
3.00%
|
3.00%
|
3.00%
|
| Benefit obligation [Abstract] |
|
|
|
| Discount rate |
4.00%
|
4.25%
|
4.00%
|
| Rate of compensation increase |
3.00%
|
3.00%
|
3.00%
|
| SERP [Member] | Minimum [Member] |
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
| Number of monthly payments entitled to beneficiary in case participant dies prior to receiving one hundred twenty monthly payments |
60 months
|
|
|