CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Activities
Net income	$ 20,400	$ 31,736
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions
Depreciation	22,809	22,157
Amortization of intangible assets	4,221	4,484
Share-based compensation expense	4,693	4,476
Deferred income taxes	17	31
Other	741	(221)
Changes in operating assets:
Change in accounts receivable	16,139	12,874
Change in inventory	2,550	(200)
Change in other operating assets	(1,022)	2,605
Changes in operating liabilities:
Change in accounts payable	(9,160)	(11,201)
Change in accrued liabilities	(12,105)	(4,874)
Change in income tax payable	3,853	5,678
Change in other operating liabilities	539	2,344
Net cash flows provided by operating activities	53,675	69,889
Cash flows from investing activities
Acquisitions, net of cash received	591
Purchases of property, plant and equipment	(14,208)	(18,639)
Purchases of short-term investments	(1,523)	(3,153)
Purchase of equity securities	(6,129)
Proceeds from maturity of short-term investments	3,467	3,982
Other	244	658
Net cash and cash equivalents used in investing activities	(17,558)	(17,152)
Cash flows from financing activities
Advances on lines of credit and short-term debt	3,647	3,568
Repayments of line of credit and short-term debt	(3,498)	(1,461)
Taxes paid related to net share settlement	(4,467)	(645)
Proceeds from long-term debt	82,331	85,000
Repayments of long-term debt	(98,884)	(83,089)
Net proceeds from issuance of common stock		6,667
Repayment of and proceeds from finance lease obligation	(223)	(293)
Dividend distribution to noncontrolling interests	(108)
Other	(195)	(120)
Net cash and cash equivalents (used in) provided by financing activities	(21,397)	9,627
Effect of exchange rate changes on cash and cash equivalents	(3,315)	(1,890)
Change in cash and cash equivalents, including restricted cash	11,405	60,474
Cash and cash equivalents, beginning of period, including restricted cash	259,507	241,833
Cash and cash equivalents, end of period, including restricted cash	270,912	302,307
Supplemental Cash Flow Information
Interest paid during the period	1,068	2,095
Taxes paid during the period	6,091	4,323
Non-cash investing and financing activities:
Accounts payable balance related to the purchase of property, plant and equipment	$ 8,847	$ 9,886