Condensed Consolidated Statements of Operations and Retained Earnings - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Revenues [Abstract]
Net sales	$ 203,726	$ 149,013
Cost of products sold	134,418	100,966
Gross profit	69,308	48,047
Operating Expenses [Abstract]
Selling expenses	23,800	18,814
General and administrative expenses	18,852	13,783
Research and Development Expense	2,922	2,499
Amortization of intangibles	3,719	1,750
Total operating expenses	49,293	36,846
Income from operations	20,015	11,201
Other Income & Expenses [Abstract]
Interest and debt expense	5,141	2,574
Investment (income) loss	(62)	(217)
Foreign currency exchange (gain) loss	324	(563)
Other (income) expense, net	(139)	(80)
Income before income tax expense	14,751	9,487
Income Tax Expense Benefit [Abstract]
Income tax expense	3,095	3,086
Net income	11,656	6,401
Retained Earnings Accumulated Deficit [Abstract]
Retained earnings - beginning of period	179,735	174,173
Retained earnings - end of period	$ 191,391	$ 180,574
Weighted Average Number Of Shares Outstanding Basic [Abstract]
Average basic shares outstanding	22,580,000	20,135,000
Weighted Average Number Of Shares Outstanding [Abstract]
Average diluted shares outstanding	23,028,000	20,266,000
Earnings Per Share Basic [Abstract]
Basic income per share:	$ 0.52	$ 0.32
Earnings Per Share Diluted [Abstract]
Diluted income per share:	0.51	$ 0.32
Common Stock, Dividends, Per Share, Declared	$ 0.04