RETIREMENT FUND AND PROFIT SHARING PLAN (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Employer match of the first 1% of compensation contributed by participants (in hundredths)	100.00%
Percentage of participant contribution under condition one (in hundredths)	1.00%
Employer match of the next 5% compensation contributed by participants (in hundredths)	50.00%
Percentage of employee deferrals under condition two (in hundredth)	5.00%
Maximum employer matching contribution per participant under prior plan hundredths)	5.00%
Minimum employer matching contribution (in hundredths)	5.00%
Employer matching contribution (in hundredths)	7.00%
Maximum employer matching contribution per plan participant under prior plan	$ 350
Summary of information about changes in plan assets and benefit obligation, the funded status [Abstract]
Related Liabilities	11,045,000	9,274,000
Fair value of life insurance policies and marketable securities held in a rabbi trust	11,100,000	10,500,000
Estimated net loss that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year	200,000
Prior service cost that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year	100,000
Class A [Member]
Defined Benefit Plan Disclosure [Line Items]
Shares owned by plan (in shares)	15,325
Class B [Member]
Defined Benefit Plan Disclosure [Line Items]
Shares owned by plan (in shares)	220,781
SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Compensation expenses	1,100,000	900,000	800,000
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 (in hundredths)	40.00%
Number of consecutive calendar years of plan participation to calculate average base compensation	20 years
Early retirement age	55 years
Number of monthly payments under the plan	120 months
Minimum number of monthly payments entitled to beneficiary in case participant dies prior to receiving one hundred twenty monthly payments	60 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 (in hundredths)	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 following four years from date of death (in hundredths)	50.00%
Period for which beneficiary will receive fifty percent annual base salary	4 years
Components of SERP expense [Abstract]
Service Cost	438,000	371,000	340,000
Interest Cost	417,000	404,000	336,000
Net amortization	230,000	149,000	133,000
Net periodic benefit cost	1,085,000	924,000	809,000
Summary of information about changes in plan assets and benefit obligation, the funded status [Abstract]
Fair value of plan assets	0	0
Company contributions	0	0
Benefits paid	0	0
Fair value of plan assets	0	0	0
Benefit obligation January 1	9,274,000	7,350,000
Service cost	438,000	371,000	340,000
Interest cost	417,000	404,000	336,000
Benefits paid	0	0
Actuarial losses	916,000	1,149,000
Benefit obligation, December 31	11,045,000	9,274,000	7,350,000
Funded status, December 31	(11,045,000)	(9,274,000)
Related Liabilities	11,000,000	9,300,000
Accumulated benefit obligation	9,300,000	7,500,000
Expected future benefit payments [Abstract]
2013	0
2014	182,000
2015	237,000
2016	237,000
2017	237,000
2018 - 2022	2,732,000
Amounts recognized in accumulated other comprehensive loss, pretax:
Prior service cost	877,000	1,010,000
Net loss	2,884,000	2,065,000
Total amounts recognized in accumulated other comprehensive loss	3,761,000	3,075,000
Net periodic benefit cost
Discount rate (in hundredths)	4.50%	5.50%	6.00%
Rate of compensation increase (in hundredths)	3.00%	3.00%	3.00%
Benefit obligation
Discount rate (in hundredths)	4.00%	4.50%	5.50%
Rate of compensation increase (in hundredths)	3.00%	3.00%	3.00%
Retirement Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Compensation expenses	300,000	300,000	300,000
Retirement Fund [Member] | Class A [Member]
Defined Benefit Plan Disclosure [Line Items]
Shares owned by plan (in shares)	3,323
Retirement Fund [Member] | Class B [Member]
Defined Benefit Plan Disclosure [Line Items]
Shares owned by plan (in shares)	17,342
401(k) Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Compensation expenses	$ 500,000	$ 900,000	$ 700,000