INCOME TAXES (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Domestic and foreign components of pretax income
Domestic			$ 76,042,000	$ 87,016,000	$ 82,276,000
Foreign			8,519,000	10,896,000	10,302,000
Earnings before income taxes			84,561,000	97,912,000	92,578,000
Current:
Federal			6,019,000	28,484,000	26,259,000
Foreign				86,000	(596,000)
State			369,000	1,954,000	785,000
Total current			6,388,000	30,524,000	26,448,000
Deferred:
Federal			(7,191,000)	(2,547,000)	(1,189,000)
Foreign			3,425,000	3,323,000	2,106,000
State			1,285,000	(707,000)	(914,000)
Total deferred			(2,481,000)	69,000	3,000
Total provision for income taxes			3,907,000	30,593,000	$ 26,451,000
Deferred tax assets:
Accrued customer promotions	$ 1,583,000		1,583,000	3,194,000
Deferred compensation	15,403,000		15,403,000	26,509,000
Postretirement benefits	3,352,000		3,352,000	4,732,000
Other accrued expenses	4,200,000		4,200,000	6,543,000
Foreign subsidiary tax loss carry forward	7,270,000		7,270,000	8,452,000
Tax credit carry forward	3,435,000		3,435,000	2,514,000
Deferred tax assets, gross	35,243,000		35,243,000	51,944,000
Valuation allowance	(3,269,000)		(3,269,000)	(2,317,000)
Total deferred tax assets	31,974,000		31,974,000	49,627,000
Deferred tax liabilities:
Depreciation	18,791,000		18,791,000	28,049,000
Deductible goodwill and trademarks	34,593,000		34,593,000	45,733,000
Accrued export company commissions	4,189,000		4,189,000	6,044,000
Employee benefit plans	4,662,000		4,662,000	928,000
Inventory reserves	2,147,000		2,147,000	3,529,000
Prepaid insurance	769,000		769,000	1,015,000
Other prepaid expenses	1,196,000		1,196,000
Deferred foreign exchange gain	405,000		405,000	436,000
Unrealized capital gain	977,000		977,000	733,000
Deferred gain on sale of real estate	5,278,000		5,278,000	8,093,000
Total deferred tax liabilities	73,007,000		73,007,000	94,560,000
Net deferred tax liability	41,033,000		41,033,000	$ 44,933,000
Benefits related to foreign subsidiary tax credit carryforwards	288,000		288,000
State tax credit carry-forwards expiring in 2018	104,000		104,000
State tax credit carry-forwards expiring in 2019	853,000		853,000
State tax credit carry-forwards expiring in 2020	674,000		674,000
State tax credit carry-forwards expiring in 2021	609,000		609,000
State tax credit carry-forwards expiring in 2029	220,000		220,000
State tax credit carry-forwards expiring in 2030	222,000		222,000
State tax credit carry-forwards expiring in 2031	234,000		234,000
State tax credit carry-forwards expiring in 2032	231,000		$ 231,000
U.S. statutory rate (as a percent)			35.00%	35.00%	35.00%
Favorable adjustment	$ 20,318,000		$ 20,318,000
Foreign earnings subject to toll			$ 0
Forecast
Deferred tax liabilities:
U.S. statutory rate (as a percent)		21.00%