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Statements of Consolidated Income (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Statement [Abstract]        
Net sales $ 100,828 $ 114,206 $ 311,233 $ 334,992
Cost of products sold 69,168 75,699 210,725 223,507
GROSS PROFIT 31,660 38,507 100,508 111,485
Costs and expenses        
Selling 8,874 9,344 27,226 27,746
General and administrative 10,386 12,788 33,993 36,944
Research and engineering 3,714 3,893 11,055 11,295
Other operating expense (income) 419 (677) 2,611 562
Total costs and expenses 23,393 25,348 74,885 76,547
OPERATING INCOME 8,267 13,159 25,623 34,938
Other income (expense)        
Interest income 204 160 454 476
Interest expense (121) (144) (329) (489)
Other income 194 235 393 589
Total other income (expense) 277 251 518 576
INCOME BEFORE INCOME TAXES 8,544 13,410 26,141 35,514
Income taxes 2,440 4,126 8,686 11,501
NET INCOME $ 6,104 $ 9,284 $ 17,455 $ 24,013
BASIC EARNINGS PER SHARE        
Net income $ 1.14 $ 1.75 $ 3.25 $ 4.51
DILUTED EARNINGS PER SHARE        
Net income $ 1.12 $ 1.71 $ 3.20 $ 4.42
Cash dividends declared per share $ 0.20 $ 0.20 $ 0.40 $ 0.60
Weighted-average number of shares outstanding-basic 5,361 5,319 5,369 5,328
Weighted-average number of shares outstanding-diluted 5,449 5,431 5,450 5,432