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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income $ 9,448 $ 13,305
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 2,338 2,228
Provision for doubtful accounts 15 47
Noncash stock compensation 212 194
Deferred tax benefit (674) (503)
Change in fair value of derivatives (87) 0
Changes in:    
Accounts receivable (8,694) (14,397)
Inventories (10,763) (11,679)
Other assets 340 (1,564)
Accounts payable and accrued expenses (9,109) 8,480
Income taxes, net 4,581 2,578
Net cash used in operating activities (12,393) (1,311)
Cash flows from investing activities:    
Purchases of short-term investments (14,336) (56,437)
Proceeds from sale of short-term investments 5,510 69,593
Purchases of equipment and leasehold improvements (1,422) (687)
Payment for intangible assets acquired (111) (774)
Net cash provided by (used in) investing activities (10,359) 11,695
Cash flows from financing activities:    
Proceeds from loans payable - banks, net 0 168
Repayment of long-term debt (5,479) 0
Proceeds from exercise of options 132 82
Proceeds from sale of stock of subsidiary 143 98
Dividends paid (4,035) (3,717)
Net cash used in financing activities (9,239) (3,369)
Effect of exchange rate changes on cash 6,486 (9,911)
Net decrease in cash and cash equivalents (25,505) (2,896)
Cash and cash equivalents - beginning of period 176,967 90,138
Cash and cash equivalents - end of period 151,462 87,242
Cash paid for:    
Interest 560 168
Income taxes $ 3,782 $ 7,365