CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 1,058,482	$ 971,975	$ 980,392
Cost of sales	735,995	690,987	690,762
Gross profit	322,487	280,988	289,630
Selling, general and administrative expenses	221,658	206,287	193,525
Litigation charge	0	0	10,650
Restructuring and integration expense (income)	3,957	(134)	1,197
Other income, net	1,195	1,025	1,080
Operating income	98,067	75,860	85,338
Other non-operating income (expense), net	2,059	(220)	(1,969)
Interest expense	1,556	1,537	1,616
Earnings from continuing operations before taxes	98,570	74,103	81,753
Provision for income taxes	36,158	25,983	28,854
Earnings from continuing operations	62,412	48,120	52,899
Loss from discontinued operations, net of income tax benefit of $1,322, $1,401 and $6,580	(1,982)	(2,102)	(9,870)
Net earnings	$ 60,430	$ 46,018	$ 43,029
Net earnings per common share - Basic:
Earnings from continuing operations (in dollars per share)	$ 2.75	$ 2.11	$ 2.31
Discontinued operations (in dollars per share)	(0.09)	(0.09)	(0.43)
Net earnings per common share - Basic (in dollars per share)	2.66	2.02	1.88
Net earnings per common share - Diluted:
Earnings from continuing operations (in dollars per share)	2.70	2.08	2.28
Discontinued operations (in dollars per share)	(0.08)	(0.09)	(0.43)
Net earnings per common share - Diluted (in dollars per share)	2.62	1.99	1.85
Dividend declared per share (in dollars per share)	$ 0.68	$ 0.60	$ 0.52
Average number of common shares (in shares)	22,722,517	22,811,862	22,899,516
Average number of common shares and dilutive common shares (in shares)	23,082,578	23,142,394	23,239,925