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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 $ 60,251 $ 44,467 $ 27,376
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 7,936 6,917 6,429
Amortization of intangible assets 1,051 0 0
Gain from disposal of short-term investments (3) (4) (122)
Stock-based compensation 10,418 10,347 10,262
Loss on disposal of property and equipment 10 18 5
Deferred income taxes 911 471 1,181
Changes in operating assets and liabilities:      
Short-term investments     14,265
Notes and accounts receivable (29,179) 2,359 5,572
Inventories (410) (10,410) (1,523)
Prepaid expenses and other current assets (664) (678) (403)
Other assets 136 67 (143)
Notes and accounts payable 7,651 (415) (11,981)
Accrued expenses and other current liabilities 11,020 5,543 (7,415)
Income tax payable (4,301) 9,507 3,520
Other liabilities 1,119 536 2,105
Net cash provided by operating activities 65,946 68,725 49,128
CASH FLOWS FROM INVESTING ACTIVITIES      
Purchase of held-to-maturity financial assets (4,000)    
Business acquisition-net of cash and cash equivalents acquired (30,287)    
Increase of prepaid expenses and other current assets (508)    
Return of capital from long-term investments     46
Purchase of property and equipment (23,664) (11,596) (12,772)
Changes in restricted assets 45 (3,817) (89)
Net cash used in investing activities (58,414) (15,413) (12,815)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from issuance of ordinary shares upon exercise of employee stock options 494 514 422
Share repurchase     (10,018)
Dividends paid (20,765) (20,224) (19,897)
Net cash used in financing activities (20,271) (19,710) (29,493)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (12,739) 33,602 6,820
EFFECT OF EXCHANGE RATE CHANGES (953) (1,111) 166
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 194,211 161,720 154,734
CASH AND CASH EQUIVALENTS, END OF YEAR 180,519 194,211 161,720
SUPPLEMENTAL INFORMATION      
Interest paid 6 71 86
Income taxes paid 20,494 $ 5,892 $ 2,947
Cash paid for Shannon Systems acquisition 30,287    
Shannon Systems      
CASH FLOWS FROM INVESTING ACTIVITIES      
Business acquisition-net of cash and cash equivalents acquired (30,287)    
SUPPLEMENTAL INFORMATION      
Fair value of assets acquired, net of cash and cash equivalents acquired 43,662    
Other long-term liabilities (5,735)    
Issuance of stock (7,640)    
Cash paid for Shannon Systems acquisition $ 30,287