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FINANCIAL STATEMENT SCHEDULE I (STATEMENT OF CASH FLOWS) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
OPERATING ACTIVITIES      
Net cash provided by operating activities $ 209,703 $ 180,990 $ 95,552
INVESTING ACTIVITIES      
Net cash used in investing activities (118,487) (261,827) (164,720)
FINANCING ACTIVITIES      
Proceeds from follow-on equity offering     113,541
Insurance cost for follow-on equity offering     (6,919)
Proceeds from options exercised 580 791 687
Net cash provided by (used in) financing activities (95,471) 102,328 86,712
Net increase (decrease) in cash, cash equivalents and restricted cash 3,110 20,174 22,454
Cash, cash equivalents and restricted cash at the beginning of the year (includes $8,952,260, $1,091,190 and $845,199 of cash, cash equivalents and restricted cash in current assets associated with discontinued operations on December 31, 2018, 2019 and 2020) 115,294 95,120 72,666
Cash, cash equivalents and restricted cash at the end 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, 2018, 2019 and 2020) 118,404 115,294 95,120
Parent Company [Member]      
OPERATING ACTIVITIES      
Net cash provided by operating activities (1,066) (933) (579)
INVESTING ACTIVITIES      
Capital contributed to subsidiaries     (109,779)
Net cash used in investing activities     (109,779)
FINANCING ACTIVITIES      
Proceeds from follow-on equity offering     113,541
Insurance cost for follow-on equity offering     (6,919)
Proceeds from options exercised 580 791 687
Net cash provided by (used in) financing activities 580 791 107,309
Net increase (decrease) in cash, cash equivalents and restricted cash (486) (142) (3,049)
Cash, cash equivalents and restricted cash at the beginning of the year (includes $8,952,260, $1,091,190 and $845,199 of cash, cash equivalents and restricted cash in current assets associated with discontinued operations on December 31, 2018, 2019 and 2020) 1,346 1,488 4,537
Cash, cash equivalents and restricted cash at the end 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, 2018, 2019 and 2020) $ 860 $ 1,346 $ 1,488