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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income $ 43,248 $ 38,969 $ 37,345
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization including impairment loss 15,341 9,078 10,166
Provision for doubtful accounts 349 442 412
Noncash stock compensation 1,198 787 856
Gain on sale of license (4,652) 0 0
Excess tax benefits from stock-based compensation arrangements 0 (260) (670)
Deferred tax expense (benefit) (1,374) 829 (557)
Change in fair value of derivatives 682 903 355
Changes in:      
Accounts receivable (13,156) (12,573) (19,607)
Inventories (909) (4,354) 4,344
Other assets (297) (1,622) 425
Accounts payable and accrued expenses 18,690 12,973 (4,996)
Income taxes, net (4,556) 4,912 8,540
Net cash provided by operating activities 54,564 50,084 36,613
Cash flows from investing activities:      
Purchases of short-term investments (57,289) (62,415) (245,810)
Proceeds from sale of short-term investments 42,604 151,771 212,762
Purchase of equipment and leasehold improvements (4,777) (4,158) (3,302)
Payment for intangible assets acquired (965) (119,788) (922)
Net cash used in investing activities (20,427) (34,590) (37,272)
Cash flows from financing activities:      
Repayment of loans payable - banks 0 0 (5,765)
Proceeds from issuance of long-term debt 0 110,970 0
Repayment of long-term debt (21,884) (11,761) 0
Purchase of treasury stock (77) (32) (90)
Proceeds from exercise of options 1,579 653 953
Excess tax benefits from stock-based compensation arrangements 0 260 670
Proceeds from sale of stock of subsidiary 1,565 1,327 1,030
Dividends paid (18,015) (15,806) (14,841)
Dividends paid to noncontrolling interests (4,863) (3,836) (4,667)
Purchase of subsidiary shares from noncontrolling interests (2,941) 0 0
Net cash provided by (used in) financing activities (44,636) 81,775 (22,710)
Effect of exchange rate changes on cash (4,640) (10,440) (12,143)
Net increase (decrease) in cash and cash equivalents (15,139) 86,829 (35,512)
Cash and cash equivalents - beginning of year 176,967 90,138 125,650
Cash and cash equivalents - end of year 161,828 176,967 90,138
Cash paid for:      
Interest 2,239 2,400 1,508
Income taxes $ 28,124 $ 19,668 $ 104,430