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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net income $ 67,235 $ 60,547
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 6,329 8,274
Provision for doubtful accounts 748 483
Lease expense 1,046
Share based compensation 2,735 1,567
Deferred tax (benefit) (4,183) (1,785)
Change in fair value of derivatives (1,377) (16)
Changes in:    
Accounts receivable (43,657) (51,894)
Inventories (12,222) (28,513)
Other assets (1,447) 53
Accounts payable and accrued expenses (15,973) (5,154)
Income taxes, net 7,469 12,684
Net cash provided by (used in) operating activities 6,703 (3,754)
Cash flows from investing activities:    
Purchases of short-term investments (27,694) (10,018)
Proceeds from sale of short-term investments 39,355
Purchases of equipment and leasehold improvements (4,727) (2,873)
Payment for intangible assets acquired (5,519) (8,259)
Net cash provided by (used in) investing activities 1,415 (21,150)
Cash flows from financing activities:    
Repayments of long-term debt (16,795) (17,881)
Proceeds from exercise of stock options 2,781 2,384
Purchase of subsidiary shares from noncontrolling interest (6,087) (808)
Dividends paid (25,928) (19,707)
Dividends paid to noncontrolling interest (9,654) (8,706)
Net cash (used in) financing activities (55,683) (44,718)
Effect of exchange rate changes on cash (7,114) (5,168)
Net decrease in cash and cash equivalents (54,679) (74,790)
Cash and cash equivalents - beginning of period 193,136 208,343
Cash and cash equivalents - end of period 138,457 133,553
Cash paid for:    
Interest 1,391 1,220
Income taxes $ 20,888 $ 18,792