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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 200,002 $ 79,746 $ 64,398
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 17,160 13,562 12,447
Amortization of intangible assets 0 0 766
Gain from disposal of short-term investments   (169) (48)
Gain (loss) from disposal of subsidiary   293 (12,409)
Gain from disposal of long-term investments     (473)
Stock-based compensation 19,545 14,589 14,591
Loss on disposal of property and equipment 208 143 22
Impairment of goodwill and intangible assets 0 17,489 15,970
Deferred income taxes (1,743) (667) 1,118
Changes in operating assets and liabilities:      
Short-term investments   2,391 1,627
Notes and accounts receivable (92,749) (7,091) (18,755)
Inventories (78,095) (21,723) (10,155)
Prepaid expenses and other current assets 1,230 (5,031) (1,932)
Other assets 35 172 (397)
Notes and accounts payable 36,233 13,848 4,426
Refund liabilities 1,777 (154) 167
Accrued expenses and other current liabilities 26,394 7,328 10,607
Income tax payable 37,315 4,421 (1,698)
Other liabilities 7,386 (1,918) (2,577)
Net cash provided by operating activities 174,698 117,229 77,695
CASH FLOWS FROM INVESTING ACTIVITIES      
Purchase of long-term investment (3,507) (2,000)  
Proceeds from sale of subsidiary     43,968
Proceeds from sale of long-term investment     1,715
Purchase of property and equipment (24,657) (19,545) (11,015)
Net cash provided by (used in) investing activities (28,164) (21,545) 34,668
CASH FLOWS FROM FINANCING ACTIVITIES      
Repayments of bank loan   (50,000)  
Proceeds from bank loan   50,000  
Dividends paid (54,039) (48,901) (44,029)
Share repurchase (45,696) (25,013) (26,231)
Net cash used in financing activities (99,735) (73,914) (70,260)
NET INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH 46,799 21,770 42,103
EFFECT OF EXCHANGE RATE CHANGES (487) (812) (977)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, BEGINNING OF YEAR 369,211 348,253 307,127
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, END OF YEAR 415,523 369,211 348,253
SUPPLEMENTAL INFORMATION      
Interest paid   11  
Income taxes paid 3,523 8,518 5,612
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 2,281 2,105 523
Dividend declared included in accrued expenses and accrued liabilities $ 51,681 $ 36,658 $ 35,906