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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net income $ 53,303 $ 70,908
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 6,018 4,115
Provision for doubtful accounts (153) 220
Noncash stock compensation 589 633
Share of income of equity investment 32 (41)
Noncash lease expense 1,485 1,324
Deferred tax provision (1,461) (1,188)
Change in fair value of derivatives (24) 1,518
Changes in:    
Accounts receivable (50,436) (42,670)
Inventories (34,388) (29,688)
Other assets (5,245) (5,640)
Operating lease liabilities (1,468) (1,293)
Accounts payable and accrued expenses (27,736) (23,327)
Income taxes, net 7,524 17,771
Net cash used in operating activities (51,960) (7,358)
Cash flows from investing activities:    
Purchases of short-term investments (59,619) (42,835)
Proceeds from sale of short-term investments 74,905 107,045
Purchases of property, equipment and leasehold improvements (1,059) (2,415)
Payment for intangible assets acquired (305) (151)
Net cash provided by investing activities 13,922 61,644
Cash flows from financing activities:    
Proceeds from loans payable, bank 4,000
Proceeds from issuance of long-term debt 17,989
Repayment of long-term debt (9,425) (9,397)
Proceeds from exercise of options 1,326 4,929
Dividends paid (24,032) (20,023)
Dividends paid to noncontrolling interest (473)
Purchase of treasury stock (5,580)
Net cash used in financing activities (28,131) (12,555)
Effect of exchange rate changes on cash (1,317) 2,611
Net (decrease) increase in cash and cash equivalents (67,486) 44,342
Cash and cash equivalents - beginning of period 88,462 104,713
Cash and cash equivalents - end of period 20,976 149,055
Cash paid for:    
Interest 1,127 1,563
Income taxes $ 10,479 $ 4,816