Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating Activities
Net income	$ 43,706	$ 33,925
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,467	7,061
Loss on disposal of property and equipment	42	20
Deferred income taxes	6,147	4,206
Amortization of debt origination costs	1,400	851
Stock-based compensation costs	1,464	1,381
Non-cash operating lease cost	1,831	1,338
Interest expense relating to finance lease liability	50	0
Changes in operating assets and liabilities:
Accounts receivable	39,734	5,808
Inventories	51	(8,939)
Prepaid expenses and other current assets	(4,019)	(4,335)
Accounts payable	(32,386)	5,306
Accrued liabilities	11,588	7,616
Operating lease liabilities	(1,812)	(1,368)
Other	(109)	(93)
Net cash provided by operating activities	75,154	52,777
Investing Activities
Purchases of property, plant and equipment	(2,553)	(1,956)
Net cash used in investing activities	(2,553)	(1,956)
Financing Activities
Term loan repayments	(56,000)	0
Borrowings under revolving credit agreement	0	15,000
Repayments under revolving credit agreement	(55,000)	(35,000)
Payments of finance leases	(336)	0
Proceeds from exercise of stock options	1,216	275
Fair value of shares surrendered as payment of tax withholding	(1,242)	(799)
Repurchase of common stock	0	(28,766)
Net cash used in financing activities	(111,362)	(49,290)
Effects of exchange rate changes on cash and cash equivalents	1,942	(19)
(Decrease) increase in cash and cash equivalents	(36,819)	1,512
Cash and cash equivalents - beginning of period	94,760	27,530
Cash and cash equivalents - end of period	57,941	29,042
Interest paid	5,571	19,966
Income taxes paid	$ 2,182	$ 1,807