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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 $ 110,940 $ 60,251 $ 44,467
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 9,482 7,936 6,917
Amortization of intangible assets 2,103 1,051 0
Gain from disposal of short-term investments (2) (3) (4)
Impairment of long-term investments 13    
Stock-based compensation 17,364 10,418 10,347
Loss on disposal of property and equipment 33 10 18
Deferred income taxes (3,373) 911 471
Changes in operating assets and liabilities:      
Short-term investments (2,710)    
Notes and accounts receivable (14,620) (29,179) 2,359
Inventories (24,777) (410) (10,410)
Prepaid expenses and other current assets (1,313) (664) (678)
Other assets (5) 136 67
Notes and accounts payable 9,198 7,651 (415)
Accrued expenses and other current liabilities 12,180 11,020 5,543
Income tax payable 6,876 (4,301) 9,507
Other liabilities 4,179 1,119 536
Net cash provided by operating activities 125,568 65,946 68,725
CASH FLOWS FROM INVESTING ACTIVITIES      
Purchase of held-to-maturity financial assets   (4,000)  
Proceeds from sale of held-to-maturity financial assets 4,000    
Business acquisition-net of cash, cash equivalents, and restricted cash acquired   (30,286)  
Increase of prepaid expenses and other current assets   (508)  
Purchase of property and equipment (12,220) (23,664) (11,596)
Net cash used in investing activities (8,220) (58,458) (11,596)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from issuance of ordinary shares upon exercise of employee stock options 93 494 514
Proceeds from bank loan 25,000    
Dividends paid (22,899) (20,765) (20,224)
Net cash provided by (used in) financing activities 2,194 (20,271) (19,710)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH 119,542 (12,783) [1] 37,419 [1]
EFFECT OF EXCHANGE RATE CHANGES (521) (953) (1,111)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, BEGINNING OF YEAR [1] 202,156 215,892 179,584
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, END OF YEAR 321,177 202,156 [1] 215,892 [1]
SUPPLEMENTAL INFORMATION      
Interest paid 105 6 71
Income taxes paid $ 24,300 20,494 $ 5,892
Cash paid for business acquisition, net of cash, cash equivalents, and restricted cash acquired   30,286  
Shannon Systems      
CASH FLOWS FROM INVESTING ACTIVITIES      
Business acquisition-net of cash, cash equivalents, and restricted cash acquired   (30,286)  
SUPPLEMENTAL INFORMATION      
Fair value of assets acquired, net of cash, cash equivalents, and restricted cash acquired   43,661  
Other long-term liabilities   (5,735)  
Issuance of stock   (7,640)  
Cash paid for business acquisition, net of cash, cash equivalents, and restricted cash acquired   $ 30,286  
[1] The restricted cash is only included in the amount of "as adjusted" item.