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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net income $ 46,291 $ 36,626
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 3,124 2,529
Provision for doubtful accounts 1,048 1,354
Noncash stock compensation 654 732
Share of income of equity investment (116) (192)
Impairment loss 2,393
Noncash lease expense 1,881 1,735
Deferred tax provision 135 58
Change in fair value of derivatives (3,803) 1,699
Changes in:    
Accounts receivable (50,316) (32,566)
Inventories (31,195) 4,951
Other assets (2,869) (3,819)
Operating lease liabilities (1,671) (1,499)
Accounts payable and accrued expenses 3,203 8,102
Income taxes, net 9,690 10,413
Net cash provided by (used in) operating activities (23,944) 32,516
Cash flows from investing activities:    
Purchases of short-term investments (2,243) (30,367)
Proceeds from sale of short-term investments 3,982
Purchases of property, equipment and leasehold improvements (12,895) (1,205)
Payment for intangible assets acquired (647) (302)
Net cash used in investing activities (11,803) (31,874)
Cash flows from financing activities:    
Repayment of long-term debt (4,379) (14,324)
Proceeds from exercise of options 708 1,467
Dividends paid (15,921) (7,913)
Dividends paid to noncontrolling interest (440)
Net cash used in financing activities (20,032) (20,770)
Effect of exchange rate changes on cash (2,486) (6,240)
Net decrease in cash and cash equivalents (58,265) (26,368)
Cash and cash equivalents - beginning of period 168,387 169,681
Cash and cash equivalents - end of period 110,122 143,313
Cash paid for:    
Interest 797 375
Income taxes $ 5,193 $ 2,861