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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income $ 36,626 $ 13,299
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 2,529 2,230
Provision for doubtful accounts 1,354 444
Noncash stock compensation 732 124
Share of income of equity investment (192)
Impairment loss 2,393
Lease expense 236 19
Deferred tax provision (benefit) 58 (463)
Change in fair value of derivatives 1,699 (170)
Changes in:    
Accounts receivable (32,566) (4,545)
Inventories 4,951 (4,702)
Other assets (3,819) (3,545)
Accounts payable and accrued expenses 8,102 (29,821)
Income taxes, net 10,413 2,013
Net cash provided by (used in) operating activities 32,516 (25,117)
Cash flows from investing activities:    
Purchases of short-term investments (30,367) (2,342)
Purchases of equipment and leasehold improvements (1,205) (1,254)
Payment for intangible assets acquired (302) (460)
Net cash used in investing activities (31,874) (4,056)
Cash flows from financing activities:    
Repayment of long-term debt (14,324) (6,577)
Proceeds from exercise of options 1,467 641
Dividends paid (7,913) (10,399)
Dividends paid to noncontrolling interest   (324)
Net cash used in financing activities (20,770) (16,659)
Effect of exchange rate changes on cash (6,240) (4,028)
Net decrease in cash and cash equivalents (26,368) (49,860)
Cash and cash equivalents - beginning of period 169,681 133,417
Cash and cash equivalents - end of period 143,313 83,557
Cash paid for:    
Interest 375 462
Income taxes $ 2,861 $ 3,706