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STATEMENTS OF CONSOLIDATED INCOME (UNAUDITED) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Statement [Abstract]        
Net sales $ 99,981 $ 111,716 $ 189,906 $ 210,405
Cost of products sold 68,784 74,167 131,261 141,557
GROSS PROFIT 31,197 37,549 58,645 68,848
Costs and expenses        
Selling 9,061 9,291 17,566 18,352
General and administrative 10,836 12,127 21,994 23,607
Research and engineering 4,183 3,571 7,958 7,341
Other operating (income) expense (495) 2,071 (698) 2,192
Total costs and expenses 23,585 27,060 46,820 51,492
OPERATING INCOME 7,612 10,489 11,825 17,356
Other income (expense)        
Interest income 98 134 207 250
Interest expense (202) (105) (363) (208)
Other income (expense) 98 162 74 199
Total other income (expense) (6) 191 (82) 241
INCOME BEFORE INCOME TAXES 7,606 10,680 11,743 17,597
Income taxes 2,526 4,294 3,925 6,246
NET INCOME $ 5,080 $ 6,386 $ 7,818 $ 11,351
BASIC EARNINGS PER SHARE        
Net income $ 0.94 $ 1.19 $ 1.45 $ 2.11
DILUTED EARNINGS PER SHARE        
Net income $ 0.94 $ 1.17 $ 1.44 $ 2.08
Cash dividends declared per share $ 0.20 $ 0.20 $ 0.40 $ 0.20
Weighted-average number of shares outstanding-basic 5,389 5,368 5,390 5,372
Weighted-average number of shares outstanding-diluted 5,393 5,450 5,430 5,450