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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income $ 18,167 $ 9,448
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 2,619 2,338
Provision for doubtful accounts 225 15
Noncash stock compensation 507 212
Deferred tax benefit (406) (674)
Change in fair value of derivatives (285) (87)
Changes in:    
Accounts receivable (33,983) (8,694)
Inventories (13,274) (10,763)
Other assets (743) 340
Accounts payable and accrued expenses (563) (9,109)
Income taxes, net 4,733 4,581
Net cash used in operating activities (23,003) (12,393)
Cash flows from investing activities:    
Purchases of short-term investments (24,310) (14,336)
Proceeds from sale of short-term investments 4,259 5,510
Purchases of equipment and leasehold improvements (729) (1,422)
Payment for intangible assets acquired (129) (111)
Net cash used in investing activities (20,909) (10,359)
Cash flows from financing activities:    
Repayment of long-term debt (5,250) (5,479)
Proceeds from exercise of options 542 132
Proceeds from sale of stock of subsidiary 0 143
Dividends paid (5,293) (4,035)
Net cash used in financing activities (10,001) (9,239)
Effect of exchange rate changes on cash 1,914 6,486
Net decrease in cash and cash equivalents (51,999) (25,505)
Cash and cash equivalents - beginning of period 161,828 176,967
Cash and cash equivalents - end of period 109,829 151,462
Cash paid for:    
Interest 492 560
Income taxes $ 4,576 $ 3,782