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Statements of Consolidated Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Statement [Abstract]      
Net sales $ 409,776 $ 439,192 $ 424,404
Cost of products sold 278,875 294,754 283,555
GROSS PROFIT 130,901 144,438 140,849
Costs and expenses      
Selling 35,704 37,093 35,825
General and administrative 44,557 46,222 44,396
Research and engineering 14,708 15,447 13,360
Other operating (income) expenses - net 3,922 1,554 1,914
Goodwill impairment 862 0 0
Total costs and expenses 99,753 100,316 95,495
OPERATING INCOME 31,148 44,122 45,354
Other income (expense)      
Interest income 618 648 575
Interest expense (450) (597) (827)
Other income 478 654 892
Total other income (expense) 646 705 640
INCOME BEFORE INCOME TAXES 31,794 44,827 45,994
Income taxes 11,207 15,541 15,010
NET INCOME $ 20,587 $ 29,286 $ 30,984
BASIC EARNINGS PER SHARE      
Net income $ 3.84 $ 5.50 $ 5.89
DILUTED EARNINGS PER SHARE      
Net income $ 3.77 $ 5.45 $ 5.78
Cash dividends declared per share $ 0.60 $ 1.00 $ 0.80
Weighted-average number of shares outstanding - basic 5,361 5,324 5,259
Weighted-average number of shares outstanding - diluted 5,467 5,371 5,358