CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) [Abstract]
Net sales	$ 288,977	$ 269,382	$ 527,888	$ 496,971
Cost of sales	201,901	196,622	367,816	360,322
Gross profit	87,076	72,760	160,072	136,649
Selling, general and administrative expenses	54,758	51,736	107,756	100,934
Restructuring and integration expenses (income)	771	(26)	1,012	31
Other income, net	297	262	559	543
Operating income	31,844	21,312	51,863	36,227
Other non-operating income, net	265	548	598	699
Interest expense	394	480	705	906
Earnings from continuing operations before taxes	31,715	21,380	51,756	36,020
Provision for income taxes	11,853	7,572	19,238	12,873
Earnings from continuing operations	19,862	13,808	32,518	23,147
Loss from discontinued operations, net of income taxes	(618)	(430)	(1,070)	(821)
Net earnings	$ 19,244	$ 13,378	$ 31,448	$ 22,326
Net earnings per common share - Basic:
Earnings from continuing operations (in dollars per share)	$ 0.87	$ 0.60	$ 1.43	$ 1.01
Discontinued operations (in dollars per share)	(0.02)	(0.02)	(0.04)	(0.04)
Net earnings per common share - Basic (in dollars per share)	0.85	0.58	1.39	0.97
Net earnings per common share - Diluted:
Earnings from continuing operations (in dollars per share)	0.86	0.59	1.41	1.00
Discontinued operations (in dollars per share)	(0.02)	(0.01)	(0.04)	(0.04)
Net earnings per common share - Diluted (in dollars per share)	0.84	0.58	1.37	0.96
Dividends declared per share (in dollars per share)	$ 0.17	$ 0.15	$ 0.34	$ 0.30
Average number of common shares (in shares)	22,705,310	22,917,718	22,673,811	22,914,322
Average number of common shares and dilutive common shares (in shares)	23,018,730	23,261,094	22,988,502	23,256,255