CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 980,392	$ 983,704	$ 948,916
Cost of sales	690,762	693,250	689,247
Gross profit	289,630	290,454	259,669
Selling, general and administrative expenses	193,525	201,256	187,495
Litigation charge	10,650	0	0
Restructuring and integration expenses	1,197	3,357	1,437
Other income, net	1,080	1,022	694
Operating income	85,338	86,863	71,431
Other non-operating income (expense), net	(1,969)	1	(696)
Interest expense	1,616	1,902	2,788
Earnings from continuing operations before taxes	81,753	84,962	67,947
Provision for income taxes	28,854	31,919	24,978
Earnings from continuing operations	52,899	53,043	42,969
Loss from discontinued operations, net of income tax benefit of $6,580, $1,062 and $1,077	(9,870)	(1,593)	(1,616)
Net earnings	$ 43,029	$ 51,450	$ 41,353
Net earnings per common share - Basic:
Earnings from continuing operations (in dollars per share)	$ 2.31	$ 2.31	$ 1.88
Discontinued operations (in dollars per share)	$ (0.43)	$ (0.07)	$ (0.07)
Net earnings per common share - Basic (in dollars per share)	$ 1.88	$ 2.24	$ 1.81
Net earnings per common share - Diluted:
Earnings from continuing operations (in dollars per share)	$ 2.28	$ 2.28	$ 1.86
Discontinued operations (in dollars per share)	$ (0.43)	$ (0.07)	$ (0.07)
Net earnings per common share - Diluted (in dollars per share)	$ 1.85	$ 2.21	$ 1.79
Dividends declared per share (in dollars per share)	$ 0.52	$ 0.44	$ 0.36
Average number of common shares (in shares)	22,899,516	22,974,690	22,812,077
Average number of common shares and dilutive common shares (in shares)	23,239,925	23,270,067	23,050,340