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FINANCIAL STATEMENT SCHEDULE I (STATEMENT OF CASH FLOWS) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
OPERATING ACTIVITIES      
Net cash provided by operating activities $ 638,989 $ 209,703 $ 180,990
INVESTING ACTIVITIES      
Net cash used in investing activities (781,894) (118,487) (261,827)
FINANCING ACTIVITIES      
Proceeds from subsidiary's public offering of ordinary shares, net of issuance cost paid of $59 million 934,960    
Insurance cost for follow-on equity offering (59,000)    
Proceeds from options exercised 2,139 580 791
Net cash provided by (used in) financing activities 736,225 (95,471) 102,328
Net increase in cash, cash equivalents and restricted cash 605,562 3,110 20,174
Cash, cash equivalents and restricted cash at the beginning of the year (includes $1,091,190, $845,199 and nil of cash, cash equivalents and restricted cash in current assets associated with discontinued operations on December 31, 2019, 2020 and 2021) 118,404 115,294 95,120
Cash, cash equivalents and restricted cash at the end of the year (includes $845,199, nil and nil of cash, cash equivalents and restricted cash in current assets associated with discontinued operations on December 31, 2019, 2020 and 2021) 723,966 118,404 115,294
Parent Company [Member]      
OPERATING ACTIVITIES      
Net cash provided by operating activities (736) (1,066) (933)
FINANCING ACTIVITIES      
Proceeds from options exercised 2,139 580 791
Net cash provided by (used in) financing activities 2,139 580 791
Net increase in cash, cash equivalents and restricted cash 1,403 (486) (142)
Cash, cash equivalents and restricted cash at the beginning of the year (includes $1,091,190, $845,199 and nil of cash, cash equivalents and restricted cash in current assets associated with discontinued operations on December 31, 2019, 2020 and 2021) 860 1,346 1,488
Cash, cash equivalents and restricted cash at the end of the year (includes $845,199, nil and nil of cash, cash equivalents and restricted cash in current assets associated with discontinued operations on December 31, 2019, 2020 and 2021) $ 2,263 $ 860 $ 1,346