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STOCKHOLDERS' EQUITY (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 687,168 $ 388,148 $ 619,688 $ 354,944
Net unrealized (loss) gain on investments, net of tax (30) (643) (168) 525
Balance at end of period 718,602 584,690 718,602 584,690
Unrealized (loss) gain on investments, tax benefit     54 0
Accumulated Net Unrealized Investment Gain (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period     318 322
Net unrealized (loss) gain on investments, net of tax     (168) 525
Foreign currency translation adjustments     3 0
Amounts reclassified from accumulated other comprehensive income     0 0
Balance at end of period $ 153 $ 847 $ 153 $ 847