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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 36,121 $ 27,378
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 5,510 4,683
Provision for doubtful accounts 215 248
Share based compensation 1,082 1,022
Deferred tax provision (benefit) (1,504) 609
Change in fair value of derivatives (134) (3,357)
Changes in:    
Accounts receivable (23,928) (7,103)
Inventories (36,044) (32,591)
Other assets (1,082) 734
Accounts payable and accrued expenses 6,310 (1,925)
Income taxes, net 7,401 (396)
Net cash used in operating activities (6,053) (10,698)
Cash flows from investing activities:    
Purchases of short-term investments (10,000) (25,018)
Proceeds from sale of short-term investments 4,328
Purchases of equipment and leasehold improvements (2,079) (1,419)
Payment for intangible assets acquired (8,041) (402)
Proceeds from sale of trademark 5,886
Net cash used in investing activities (20,120) (16,625)
Cash flows from financing activities:    
Repayments of long-term debt (12,120) (10,679)
Proceeds from exercise of stock options 1,938 625
Purchase of subsidiary shares from noncontrolling interest (808)
Dividends paid (13,130) (10,592)
Dividends paid to noncontrolling interest (8,706) (5,947)
Net cash (used in) financing activities (32,826) (26,593)
Effect of exchange rate changes on cash (4,026) 8,860
Net decrease in cash and cash equivalents (63,025) (45,056)
Cash and cash equivalents - beginning of period 208,343 161,828
Cash and cash equivalents - end of period 145,318 116,772
Cash paid for:    
Interest 853 896
Income taxes $ 12,451 $ 10,905