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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income $ 55,253 $ 43,248 $ 38,969
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization including impairment loss 11,914 15,341 9,078
Provision for doubtful accounts 939 349 442
Noncash stock compensation 2,093 1,198 787
Gain on sale of license (4,652)
Excess tax benefits from stock-based compensation arrangements (260)
Deferred tax expense (benefit) (591) (1,374) 829
Change in fair value of derivatives (1,254) 682 903
Changes in:      
Accounts receivable (6,016) (13,156) (12,573)
Inventories (28,518) (909) (4,354)
Other assets 727 (297) (1,622)
Accounts payable and accrued expenses 5,696 18,690 12,973
Income taxes, net (4,352) (4,556) 4,912
Net cash provided by operating activities 35,891 54,564 50,084
Cash flows from investing activities:      
Purchases of short-term investments (31,874) (57,289) (62,415)
Proceeds from sale of short-term investments 66,981 42,604 151,771
Purchase of equipment and leasehold improvements (3,023) (4,777) (4,158)
Payment for intangible assets acquired (1,046) (965) (119,788)
Proceeds from sale of trademark 5,886
Net cash provided by (used in) investing activities 36,924 (20,427) (34,590)
Cash flows from financing activities:      
Proceeds from issuance of long-term debt 110,970
Repayment of long-term debt (22,362) (21,884) (11,761)
Purchase of treasury stock (77) (32)
Proceeds from exercise of options 1,963 1,579 653
Excess tax benefits from stock-based compensation arrangements 260
Proceeds from sale of stock of subsidiary 1,565 1,327
Dividends paid (21,192) (18,015) (15,806)
Dividends paid to noncontrolling interests (6,039) (4,863) (3,836)
Purchase of subsidiary shares from noncontrolling interests (2,941)
Net cash provided by (used in) financing activities (47,630) (44,636) 81,775
Effect of exchange rate changes on cash 21,330 (4,640) (10,440)
Net increase (decrease) in cash and cash equivalents 46,515 (15,139) 86,829
Cash and cash equivalents - beginning of year 161,828 176,967 90,138
Cash and cash equivalents - end of year 208,343 161,828 176,967
Cash paid for:      
Interest 1,813 2,239 2,400
Income taxes $ 24,337 $ 28,124 $ 19,668