CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows From Operating Activities:
Net income (loss)	$ 91,386	$ 63,301	$ 1,097
Reconciliation to net cash provided by operating activities:
Loss (gain) on impairment and disposal of assets	141	348	240
Gain on deconsolidation of subsidiary		(13,587)
(Gain) loss on interest rate swaps and foreign currency transactions, net	(2,196)	27	(2,173)
Depreciation of property, plant, and equipment	23,815	22,196	20,491
Amortization of product rights, trademarks, and patents	1,420	1,290	1,036
Operating lease right-of-use asset amortization	3,506	3,266	3,653
Equity in losses of unconsolidated affiliate	1,177	208
Share-based compensation	17,860	18,687	20,498
Changes in reserve for uncertain tax positions	694	1,821	1,285
Changes in deferred taxes, net	(16,445)	2,388	(162)
Changes in operating assets and liabilities:
Accounts receivable, net	(10,132)	(14,921)	(20,160)
Inventories	(11,746)	1,258	15,297
Prepaid expenses and other assets	(1,854)	2,927	643
Income tax refunds, deposits, and payables, net	(4,555)	8,349	(972)
Operating lease liabilities	(3,154)	(3,198)	(3,597)
Accounts payable and accrued liabilities	(736)	3,634	20,090
Net cash provided by operating activities	89,181	97,994	57,266
Cash Flows From Investing Activities:
Purchases and construction of property, plant, and equipment	(24,034)	(27,456)	(33,855)
Proceeds from the sale of property, plant and equipment	421
Purchase of investments	(35,761)	(17,375)	(13,557)
Maturity of investments	27,969	18,771	12,411
Payment of deposits and other assets	(1,372)	(2,612)	(1,414)
Net cash used in investing activities	(32,777)	(28,672)	(36,415)
Cash Flows From Financing Activities:
Acquisition of additional ownership interest in ANP			(106)
ANP restructuring (see Note 3)		(53,592)
Proceeds from equity plans, net of withholding tax payments	15,658	15,925	23,165
Purchase of treasury stock	(39,909)	(28,873)	(24,425)
Settlement of ANP equity awards		(839)
Debt issuance costs	(407)	(1,738)
Proceeds from borrowing under lines of credit			1,238
Repayments under lines of credit		(1,161)
Proceeds from issuance of long-term debt		70,000	6,283
Principal payments on long-term debt	(1,781)	(36,740)	(8,401)
Net cash provided by (used in) financing activities	(26,439)	(37,018)	(2,246)
Effect of exchange rate changes on cash	(220)	(223)	352
Net increase (decrease) in cash, cash equivalents and restricted cash	29,745	32,081	18,957
Cash, cash equivalents, and restricted cash at beginning of period	126,588	94,507	75,550
Cash, cash equivalents, and restricted cash at end of period	156,333	126,588	94,507
Noncash Investing and Financing Activities:
Capital expenditure included in accounts payable	5,256	9,488	11,136
Operating lease right-of-use assets in exchange for operating lease liabilities	2,166	11,041	4,819
Equipment acquired under finance leases	642	107	61
Supplemental Disclosures of Cash Flow Information:
Interest paid, net of capitalized interest	3,023	2,109	2,199
Income taxes paid	$ 44,442	$ 8,096	$ 3,411