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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash Flows From Operating Activities:    
Net income $ 26,032 $ 24,253
Reconciliation to net cash provided by operating activities:    
Loss on disposal of assets 2 1
(Gain) loss on interest rate swaps and foreign currency transactions, net 195 (3,013)
Depreciation of property, plant, and equipment 6,252 5,615
Amortization of product rights, trademarks, and patents 241 352
Operating lease right-of-use asset amortization 903 828
Equity in losses of unconsolidated affiliate 785 703
Share-based compensation 6,111 5,022
Changes in operating assets and liabilities:    
Accounts receivable, net (11,796) 5,598
Inventories 268 (2,687)
Prepaid expenses and other assets 219 1,420
Income tax refunds, deposits, and payable, net 6,459 3,926
Operating lease liabilities (862) (695)
Accounts payable and accrued liabilities 5,573 9,442
Net cash provided by operating activities 40,382 50,765
Cash Flows From Investing Activities:    
Purchases and construction of property, plant, and equipment (9,477) (6,139)
Purchase of investments (10,574) (5,317)
Maturity of investments 14,064 2,535
Payment of deposits and other assets (346) (189)
Net cash used in investing activities (6,333) (9,110)
Cash Flows From Financing Activities:    
Proceeds from equity plans, net of withholding tax payments (4,565) 6,437
Purchase of treasury stock (8,015) (1,229)
Debt issuance costs   (22)
Principal payments on long-term debt (968) (538)
Net cash used in financing activities (13,548) 4,648
Effect of exchange rate changes on cash 16 (29)
Net increase in cash, cash equivalents, and restricted cash 20,517 46,274
Cash, cash equivalents, and restricted cash at beginning of period 156,333 126,588
Cash, cash equivalents, and restricted cash at end of period 176,850 172,862
Noncash Investing and Financing Activities:    
Capital expenditure included in accounts payable 4,802 6,709
Operating lease right-of-use assets in exchange for operating lease liabilities 1,150 1,777
Supplemental Disclosures of Cash Flow Information:    
Interest paid, net of capitalized interest 1,245 579
Income taxes paid $ 336 $ 183