CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net income	$ 40,553	$ 20,400
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions
Depreciation	26,440	22,809
Amortization of intangible assets	4,023	4,221
Share-based compensation expense	6,122	4,693
Deferred income taxes	1,012	17
Investment gain	(3,713)
Other	425	741
Changes in operating assets:
Change in accounts receivable	(12,993)	16,139
Change in inventory	6,490	2,550
Change in other operating assets	2,899	(1,022)
Changes in operating liabilities:
Change in accounts payable	11,266	(9,160)
Change in accrued liabilities	(8,310)	(12,105)
Change in income tax payable	(4,100)	3,853
Change in other operating liabilities	(1,918)	539
Net cash flows provided by operating activities	68,196	53,675
Cash flows from investing activities
Acquisitions, net of cash received		591
Purchases of property, plant and equipment	(17,179)	(14,208)
Proceeds from maturity of short-term investments	2,085	3,467
Purchases of short-term investments	(4,364)	(1,523)
Purchase of equity securities		(6,129)
Other	9,059	244
Net cash and cash equivalents used in investing activities	(10,399)	(17,558)
Cash flows from financing activities
Advances on lines of credit and short-term debt	2,820	3,647
Repayments of lines of credit and short-term debt	(75,696)	(3,498)
Proceeds from long-term debt	215,000	82,331
Repayments of long-term debt	(179,361)	(98,884)
Net proceeds from issuance of common stock	754
Repayment of and proceeds from finance lease obligation	(141)	(223)
Taxes paid related to net share settlement	(9,293)	(4,467)
Dividend distribution to noncontrolling interests		(108)
Capital contribution from noncontrolling interests	1,003
Other	(499)	(195)
Net cash and cash equivalents used in financing activities	(45,413)	(21,397)
Effect of exchange rate changes on cash and cash equivalents	(1,812)	(3,315)
Change in cash and cash equivalents, including restricted cash	10,572	11,405
Cash and cash equivalents, beginning of period, including restricted cash	320,529	259,507
Cash and cash equivalents, end of period, including restricted cash	331,101	270,912
Supplemental Cash Flow Information
Interest paid during the period	2,704	1,068
Taxes paid during the period	12,284	6,091
Non-cash investing and financing activities:
Accounts payable balance related to the purchase of property, plant and equipment	$ 7,960	$ 8,447