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FINANCIAL STATEMENT SCHEDULE I (STATEMENT OF CASH FLOWS) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123431023&loc=SL98516268-108586 + Details
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