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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net income $ 60,547 $ 49,481
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 8,274 7,377
Provision for doubtful accounts 483 283
Share based compensation 1,567 1,558
Deferred tax (benefit) (1,785) (2,051)
Change in fair value of derivatives (16) (1,869)
Changes in:    
Accounts receivable (51,894) (43,163)
Inventories (28,513) (27,345)
Other assets 53 542
Accounts payable and accrued expenses (5,154) (8,145)
Income taxes, net 12,684 7,203
Net cash used in operating activities (3,754) (16,129)
Cash flows from investing activities:    
Purchases of short-term investments (10,018) (25,988)
Proceeds from sale of short-term investments 10,033
Purchases of equipment and leasehold improvements (2,873) (2,253)
Payment for intangible assets acquired (8,259) (764)
Proceeds from sale of trademark 5,886
Net cash used in investing activities (21,150) (13,086)
Cash flows from financing activities:    
Repayments of long-term debt (17,881) (16,567)
Proceeds from exercise of stock options 2,384 839
Purchase of subsidiary shares from noncontrolling interest (808)
Dividends paid (19,707) (15,891)
Dividends paid to noncontrolling interest (8,706) (5,947)
Net cash (used in) financing activities (44,718) (37,566)
Effect of exchange rate changes on cash (5,168) 13,320
Net decrease in cash and cash equivalents (74,790) (53,461)
Cash and cash equivalents - beginning of period 208,343 161,828
Cash and cash equivalents - end of period 133,553 108,367
Cash paid for:    
Interest 1,220 1,351
Income taxes $ 18,792 $ 16,823