Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net income	$ 11,376	$ 38,716
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation and amortization	16,983	17,130
Non-cash lease expense	8,566	10,581
Stock-based compensation	4,002	4,127
Foreign currency (gains)/losses	(2,102)	370
(Gain)/loss on disposal of assets	(17)	517
Deferred taxes	(72)	3,292
Changes in operating assets and liabilities:
Accounts receivable, net	(15,336)	(12,463)
Inventories, net	(19,734)	17,212
Prepaid expenses and other	(12,895)	(18,110)
Other assets	(864)	941
Accounts payable	(4,495)	(5,663)
Accrued expenses	(4,129)	(40,270)
Other liabilities	(3,360)	(8,839)
Net cash (used in) / provided by operating activities	(22,077)	7,541
Cash flows from investing activities:
Purchases of property and equipment	(11,487)	(10,279)
Proceeds on investment sales	4,986	4,076
Purchases of investments	(8,195)	(3,930)
Net cash used in investing activities	(14,696)	(10,133)
Cash flows from financing activities:
Exercise of employee stock options and taxes paid related to the net shares settlement of stock awards	4,184	3,516
Payment of cash dividends	(19,392)	(19,293)
Repurchases of shares of common stock	0	(10,006)
Finance lease principal payments	(912)	(476)
Payments of debt	(2,500)	(7,500)
Proceeds from debt	20,000	0
Net cash provided by/(used in) financing activities	1,380	(33,759)
Effect of exchange rate changes on cash	609	(1,026)
Net decrease in cash and cash equivalents	(34,784)	(37,377)
Cash and cash equivalents, beginning of period	264,725	339,593
Cash and cash equivalents, end of period	$ 229,941	$ 302,216