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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income $ 38,969 $ 37,345 $ 50,966
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 9,078 10,166 11,110
Provision for doubtful accounts 442 412 574
Noncash stock compensation 787 856 838
Excess tax benefits from stock-based compensation arrangements (260) (670) (700)
Deferred tax expense (benefit) 829 (557) 4,844
Change in fair value of derivatives 903 355 (157)
Changes in:      
Accounts receivable (12,573) (19,607) 71,776
Inventories (4,354) 4,344 29,240
Other assets (1,622) 425 583
Accounts payable and accrued expenses 12,973 (4,996) (33,156)
Income taxes, net 4,912 8,540 (86,724)
Net cash provided by operating activities 50,084 36,613 49,194
Cash flows from investing activities:      
Purchases of short-term investments (62,415) (245,810) (381,843)
Proceeds from sale of short-term investments 151,771 212,762 207,082
Purchase of equipment and leasehold improvements (4,158) (3,302) (5,015)
Payment for intangible assets acquired (119,788) (922) (7,769)
Proceeds from sale of equipment 0 0 2,801
Proceeds from sale of trademark 0 0 3,481
Net cash used in investing activities (34,590) (37,272) (181,263)
Cash flows from financing activities:      
Proceeds from (repayments of) loans payable - banks 0 (5,765) (21,835)
Proceeds from issuance of long-term debt 110,970 0 0
Repayment of long-term debt (11,761) 0 0
Purchase of treasury stock (32) (90) (98)
Proceeds from exercise of options 653 953 1,668
Excess tax benefits from stock-based compensation arrangements 260 670 700
Proceeds from sale of stock of subsidiary 1,327 1,030 657
Dividends paid (15,806) (14,841) (28,331)
Dividends paid to noncontrolling interests (3,836) (4,667) (8,341)
Net cash provided by (used in) financing activities 81,775 (22,710) (55,580)
Effect of exchange rate changes on cash (10,440) (12,143) 5,964
Net increase (decrease) in cash and cash equivalents 86,829 (35,512) (181,685)
Cash and cash equivalents - beginning of year 90,138 125,650 307,335
Cash and cash equivalents - end of year 176,967 90,138 125,650
Cash paid for:      
Interest 2,400 1,508 1,524
Income taxes $ 19,668 $ 10,430 $ 104,992