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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Income Tax Disclosure [Abstract]          
Tax expense (benefit) $ (3,858) $ (2,752) $ (242,638) $ (5,294)  
Tax benefit from change in deferred tax asset valuation allowance resulting from merger     239,200    
Deferred tax liabilities, net 32,700   32,700    
Unrecognized tax benefits $ 17,700   $ 17,700   $ 16,600