Condensed Consolidated Statements of Operations and Retained Earnings - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Revenues [Abstract]
Net sales	$ 136,236	$ 142,932
Cost of products sold	92,652	97,367
Gross profit	43,584	45,565
Operating Expenses [Abstract]
Selling expenses	16,598	17,891
General and administrative expenses	15,102	14,079
Amortization of intangibles	593	589
Total operating expenses	32,293	32,559
Income from operations	11,291	13,006
Other Income & Expenses [Abstract]
Interest and debt expense	1,156	3,369
Investment (income) loss	(128)	(202)
Foreign currency exchange loss (gain)	(185)	(43)
Other expense (income), net	(5)	(177)
Income before income tax expense	10,453	10,059
Income Tax Expense Benefit [Abstract]
Income tax expense	3,542	3,326
Net income	6,911	6,733
Retained Earnings Accumulated Deficit [Abstract]
Retained earnings - beginning of period	157,811	133,820
Retained earnings - end of period	$ 164,722	$ 140,553
Weighted Average Number Of Shares Outstanding Basic [Abstract]
Average basic shares outstanding	20,022,000	19,850,000
Weighted Average Number Of Shares Outstanding [Abstract]
Average diluted shares outstanding	20,229,000	20,095,000
Earnings Per Share Basic [Abstract]
Net income	$ 0.35	$ 0.34
Earnings Per Share Diluted [Abstract]
Net income	0.34	$ 0.34
Common Stock, Dividends, Per Share, Declared	$ 0.04