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FINANCIAL STATEMENT SCHEDULE I (BALANCE SHEET) (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current assets:      
Cash and cash equivalents $ 76,596 $ 52,685 $ 66,402
Prepaid expenses and other current assets 11,477 15,344  
Total current assets 180,271 174,328  
TOTAL ASSETS 1,239,143 1,201,356  
Current liabilities:      
Accrued expenses and other current liabilities 30,148 12,222  
Total current liabilities 284,135 445,148  
Equity:      
Ordinary shares($0.0001 par value 500,000,000 shares authorized as of December 31, 2019 and 2020; 351,823,578 shares issued and 347,419,152 shares outstanding as of December 31, 2019; 390,423,578 shares issued and 365,235,402 shares outstanding as of December 31, 2020) 37 35  
Additional paid-in capital 412,450 387,371  
Retained earnings 330,118 200,923  
Accumulated other comprehensive (loss) income 26,267 (19,937)  
Treasury shares, at cost (4,643,150 shares as of December 31, 2019 and 2020) (1,749) (1,749)  
Total shareholders' equity 767,123 566,643  
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY $ 1,239,143 $ 1,201,356  
Ordinary shares:      
Ordinary shares, par value $ 0.0001 $ 0.0001  
Ordinary shares, shares authorized 500,000,000 500,000,000  
Ordinary shares, shares issued 390,423,578 351,823,578  
Ordinary shares, shares outstanding 365,235,402 347,419,152  
Treasury Stock, Shares 4,643,150 4,643,150  
Parent Company [Member]      
Current assets:      
Cash and cash equivalents $ 860 $ 1,346  
Prepaid expenses and other current assets 2,374 277  
Total current assets 3,234 1,623  
Investments in subsidiaries 764,046 565,242  
TOTAL ASSETS 767,280 566,865  
Current liabilities:      
Accrued expenses and other current liabilities 157 222  
Total current liabilities 157 222  
Equity:      
Ordinary shares($0.0001 par value 500,000,000 shares authorized as of December 31, 2019 and 2020; 351,823,578 shares issued and 347,419,152 shares outstanding as of December 31, 2019; 390,423,578 shares issued and 365,235,402 shares outstanding as of December 31, 2020) 37 35  
Additional paid-in capital 412,450 387,371  
Retained earnings 330,118 200,923  
Accumulated other comprehensive (loss) income 26,267 (19,937)  
Treasury shares, at cost (4,643,150 shares as of December 31, 2019 and 2020) (1,749) (1,749)  
Total shareholders' equity 767,123 566,643  
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY $ 767,280 $ 566,865  
Ordinary shares:      
Ordinary shares, par value $ 0.0001    
Ordinary shares, shares authorized 500,000,000 500,000,000  
Ordinary shares, shares issued 390,423,578 351,823,578  
Ordinary shares, shares outstanding 365,235,402 347,419,152  
Treasury Stock, Shares 4,643,150 4,643,150