CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 81,829	$ 88,241
Marketable securities	5,534	5,731
Accounts receivable - less allowance for doubtful accounts of $698 and $771 at June 30, 2012 and December 31, 2011, respectively	43,539	39,107
Inventories	57,564	53,361
Restricted cash, current	12,992	12,991
Prepaid expenses and other current assets	5,191	4,092
Refundable income taxes	1,382	2,871
Deferred income taxes	1,520	1,295
Total Current Assets	209,551	207,689
Property, plant and equipment - net	37,656	39,414
Deferred income taxes	3,358	2,814
Intangible assets - net	10,712	10,877
Goodwill	6,604	4,163
Other assets	12,265	11,954
TOTAL ASSETS	280,146	276,911
Current Liabilities:
Accounts payable	19,721	18,459
Accrued expenses	23,151	22,936
Income taxes payable	181	224
Dividends payable	857	806
Total Current Liabilities	43,910	42,425
Long-term Liabilities:
Liability for uncertain tax positions	3,977	4,132
Minimum pension obligation and unfunded pension liability	9,702	9,274
Total Long-term Liabilities	13,679	13,406
Total Liabilities	57,589	55,831
Commitments and Contingencies
Stockholders' Equity:
Preferred stock, no par value, 1,000,000 shares authorized; none issued	0	0
Additional paid-in capital	26,214	25,420
Retained earnings	196,752	196,029
Accumulated other comprehensive loss	(1,599)	(1,550)
Total Stockholders' Equity	222,557	221,080
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	280,146	276,911
Class A [Member]
Stockholders' Equity:
Common Stock	217	217
Class B [Member]
Stockholders' Equity:
Common Stock	$ 973	$ 964