CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 983,704	$ 948,916	$ 874,625
Cost of sales	693,250	689,247	645,478
Gross profit	290,454	259,669	229,147
Selling, general and administrative expenses	201,256	187,495	163,845
Restructuring and integration expenses	3,357	1,437	1,344
Other income, net	1,022	694	941
Operating income	86,863	71,431	64,899
Other non-operating income (expense), net	1	(696)	3,370
Interest expense	1,902	2,788	3,821
Earnings from continuing operations before taxes	84,962	67,947	64,448
Provision for income taxes	31,919	24,978	121
Earnings from continuing operations	53,043	42,969	64,327
Loss from discontinued operations, net of income tax benefit of $1,062, $1,077 and $1,284	(1,593)	(1,616)	(1,926)
Net earnings	$ 51,450	$ 41,353	$ 62,401
Net earnings per common share - Basic:
Earnings from continuing operations (in dollars per share)	$ 2.31	$ 1.88	$ 2.82
Discontinued operations (in dollars per share)	$ (0.07)	$ (0.07)	$ (0.08)
Net earnings per common share - Basic (in dollars per share)	$ 2.24	$ 1.81	$ 2.74
Net earnings per common share - Diluted:
Earnings from continuing operations (in dollars per share)	$ 2.28	$ 1.86	$ 2.78
Discontinued operations (in dollars per share)	$ (0.07)	$ (0.07)	$ (0.08)
Net earnings per common share - Diluted (in dollars per share)	$ 2.21	$ 1.79	$ 2.70
Dividends declared per share (in dollars per share)	$ 0.44	$ 0.36	$ 0.28
Average number of common shares (in shares)	22,974,690	22,812,077	22,794,606
Average number of common shares and dilutive common shares (in shares)	23,270,067	23,050,340	23,228,345