CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 31, 2012	Sep. 29, 2012
CURRENT ASSETS:
Cash & cash equivalents	$ 32,734	$ 63,862	$ 37,124
Investments	31,579	18,746	14,563
Trade accounts receivable, less allowances of $3,446, $2,142 & $3,501	102,786	42,108	111,578
Other receivables	3,466	5,528	6,539
Inventories:
Finished goods & work-in-process	40,437	37,046	36,506
Raw material & supplies	29,044	25,337	28,925
Prepaid expenses	1,463	4,148	4,167
Deferred income taxes	4,942	466	600
Total current assets	246,451	197,241	240,002
PROPERTY, PLANT & EQUIPMENT, at cost:
Land	21,679	21,687	21,694
Buildings	108,376	108,391	107,962
Machinery & equipment	328,520	331,110	323,277
Construction in progress	12,878	2,539	9,566
Property, plant and equipment, gross	471,453	463,727	462,499
Less-accumulated depreciation	274,448	262,437	258,112
Net property, plant and equipment	197,005	201,290	204,387
OTHER ASSETS:
Goodwill	73,237	73,237	73,237
Trademarks	175,024	175,024	175,024
Investments	162,371	126,812	129,345
Split dollar officer life insurance	41,394	66,911	70,549
Prepaid expenses			680
Deferred income taxes	6,026	6,222	8,015
Total other assets	458,052	448,206	456,850
Total assets	901,508	846,737	901,239
CURRENT LIABILITIES:
Accounts payable	14,801	8,942	18,050
Dividends payable	4,770		4,689
Accrued liabilities	49,539	45,150	49,891
Postretirement health care and life insurance benefits	555	555	574
Income taxes payable	11,113	6,118	8,137
Total current liabilities	80,778	60,765	81,341
NONCURRENT LIABILITIES:
Deferred income taxes	43,423	38,748	43,265
Postretirement health care and life insurance benefits	29,401	26,826	27,788
Industrial development bonds	7,500	7,500	7,500
Liability for uncertain tax positions	7,794	7,866	8,019
Deferred compensation and other liabilities	64,988	55,217	54,665
Total noncurrent liabilities	153,106	136,157	141,237
SHAREHOLDERS' EQUITY:
Capital in excess of par value	584,128	547,576	556,771
Retained earnings	60,478	80,210	101,171
Accumulated other comprehensive loss	(16,403)	(16,447)	(18,002)
Treasury stock (at cost)- 76, 73 & 73 shares, respectively	(1,992)	(1,992)	(1,992)
Total shareholders' equity	667,624	649,815	678,661
Total liabilities and shareholders' equity	901,508	846,737	901,239
Common stock
SHAREHOLDERS' EQUITY:
Common stock	25,955	25,450	25,693
Class B common stock
SHAREHOLDERS' EQUITY:
Common stock	$ 15,458	$ 15,018	$ 15,020