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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 79,746 $ 64,398 $ 98,070
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 13,562 12,447 11,832
Amortization of intangible assets 0 766 2,964
Gain from disposal of short-term investments (169) (48) (134)
Gain (loss) from disposal of subsidiary 293 (12,409)  
Gain from disposal of long-term investments   (473)  
Loss on equity-method investment     473
Stock-based compensation 14,589 14,591 20,779
Loss on disposal of property and equipment 143 22 66
Impairment of goodwill and intangible assets 17,489 15,970 4,069
Deferred income taxes (667) 1,118 (1,664)
Changes in operating assets and liabilities:      
Short-term investments 2,391 1,627 3,240
Notes and accounts receivable (7,091) (18,755) (12,628)
Inventories (21,723) (10,155) 12,668
Prepaid expenses and other current assets (5,031) (1,932) 2,689
Other assets 172 (397) 142
Notes and accounts payable 13,848 4,426 (28,766)
Refund liabilities (154) 167 2,093
Accrued expenses and other current liabilities 7,328 10,607 (4,679)
Income tax payable 4,421 (1,698) (7,329)
Other liabilities (1,918) (2,577) 4,357
Net cash provided by operating activities 117,229 77,695 108,242
CASH FLOWS FROM INVESTING ACTIVITIES      
Purchase of long-term investment (2,000)   (4,715)
Proceeds from sale of subsidiary   43,968  
Proceeds from sale of long-term investment   1,715  
Purchase of property and equipment (19,545) (11,015) (74,853)
Net cash provided by (used in) investing activities (21,545) 34,668 (79,568)
CASH FLOWS FROM FINANCING ACTIVITIES      
Repayments of bank loan (50,000)   (25,000)
Proceeds from bank loan 50,000    
Dividends paid (48,901) (44,029) (43,281)
Share repurchase (25,013) (26,231) (33,539)
Net cash used in financing activities (73,914) (70,260) (101,820)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH 21,770 42,103 (73,146)
EFFECT OF EXCHANGE RATE CHANGES (812) (977) (1,250)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, BEGINNING OF YEAR 348,253 307,127 381,523
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, END OF YEAR 369,211 348,253 307,127
SUPPLEMENTAL INFORMATION      
Interest paid 11   376
Income taxes paid 8,518 5,612 13,792
Disposal of FCI      
Total consideration   54,129  
Other current assets   (245)  
Cash and restricted cash disposed   (9,916)  
Proceeds from sale of subsidiary   43,968  
Non-Cash Investing and Financing Activities:      
Unpaid purchase of property and equipment included in accounts payable and accrued liabilities 2,105 523 960
Dividend declared included in accrued expenses and accrued liabilities $ 36,658 $ 35,906 $ 32,851