CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Net income	$ 236,288	$ 99,229	$ 154,115
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions:
Depreciation	106,219	91,747	91,543
Amortization of intangible assets	16,216	16,260	18,041
Amortization of debt issuance costs	754	1,455	521
Share-based compensation	33,205	25,260	20,535
Loss (gain) on disposal of property, plant and equipment	243	119	(24,429)
Deferred income taxes	21,459	(14,456)	9,904
Investment (gain)	(37,896)	(1,766)	(273)
Other	1,239	817	86
Changes in operating assets:
Accounts receivable	(52,721)	(10,501)	(30,775)
Inventories	(43,038)	(4,560)	(11,325)
Prepaid expenses and other current assets	(25,445)	(9,067)	(6,630)
Changes in operating liabilities:
Accounts payable	55,628	7,422	3,513
Accrued liabilities	29,352	(9,198)	7,369
Other liabilities	(1,455)	(2,182)	(2,694)
Income taxes payable (refundable)	(1,505)	(3,359)	271
Net cash and cash equivalents provided by operating activities	338,543	187,220	229,772
Investing Activities
Acquisitions, net of cash acquired	(157)	(24,593)	(33,028)
Purchases of short-term investments	(7,567)	(11,486)	(19,271)
Sales of short-term investments	7,328	10,277	21,847
Purchase of equity securities	(15,106)	(6,131)
Purchases of property, plant and equipment	(141,195)	(75,813)	(98,505)
Proceeds from sales of property, plant and equipment	3,207	232	29,366
Other	9,261	742	(835)
Net cash and cash equivalents used by investing activities	(144,229)	(106,772)	(100,426)
Financing Activities
Advances on lines of credit and short-term debt	21,862	77,483	9,954
Repayments on lines of credit and short-term debt	(146,372)	(40,498)	(7,362)
Proceeds from long-term debt	557,882	956,363	405,540
Repayments of long-term debt	(586,001)	(744,237)	(522,860)
Debt issuance costs	(673)	(2,477)	(223)
Repayments of finance lease obligations	(291)	(919)	(1,082)
Net proceeds from the issuance of common stock	4,337	6,830	11,901
Capital contribution from noncontrolling interest	7,803	10
Dividend distribution to noncontrolling interest	(2,172)	(2,112)	(3,818)
Repurchase of common stock		(296,705)
Taxes related to net share settlement	(14,823)	(8,302)	(4,432)
Other	7	262	(50)
Net cash and cash equivalents used by financing activities	(158,441)	(54,302)	(112,432)
Effect of exchange rate changes on cash and cash equivalents, including restricted cash	10,416	34,876	760
Increase in cash and cash equivalents, including restricted cash	46,289	61,022	17,674
Cash and cash equivalents, beginning of year, including restricted cash	320,529	259,507	241,833
Cash and cash equivalents, end of year, including restricted cash	366,818	320,529	259,507
Cash paid during the year for:
Interest	6,944	10,219	7,235
Income taxes	56,077	47,891	37,158
Non-cash activities:
Accounts payable balance related to the purchase of property, plant and equipment	$ 24,256	$ 7,297	$ 10,167