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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net income $ 17,177 $ 18,825
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 4,705 4,441
Provision for doubtful accounts 197 55
Noncash stock compensation 421 392
Deferred tax provision (862) 1,567
Change in fair value of derivatives 338 186
Changes in:    
Accounts receivable (4,460) (4,494)
Inventories (24,417) (26,182)
Other assets (611) (1,929)
Accounts payable and accrued expenses 3,633 (289)
Income taxes, net (2,021) (1,601)
Net cash used in operating activities (5,900) (9,029)
Cash flows from investing activities:    
Purchases of short-term investments (37,119) (56,307)
Proceeds from sale of short-term investments 5,576 79,592
Purchases of equipment and leasehold improvements (2,963) (1,588)
Payment for intangible assets acquired (370) (119,500)
Net cash used in investing activities (34,876) (97,803)
Cash flows from financing activities:    
Repayments of loans payable - banks, net 0 (274)
Proceeds from issuance of long-term debt 0 111,620
Repayments of long-term debt (11,085) (438)
Proceeds from exercise of options 402 428
Proceeds from sale of stock of subsidiary 428 654
Dividends paid (8,691) (7,745)
Dividends paid to noncontrolling interest (4,863) (4,759)
Net cash provided by (used in) financing activities (23,809) 99,486
Effect of exchange rate changes on cash 3,468 (5,861)
Net decrease in cash and cash equivalents (61,117) (13,207)
Cash and cash equivalents - beginning of period 176,967 90,138
Cash and cash equivalents - end of period 115,850 76,931
Cash paid for:    
Interest 1,100 1,093
Income taxes $ 13,985 $ 11,797