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INCOME TAXES - Components of Income (Loss) Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Domestic $ (33,239) $ 42,257 $ 49,905
Foreign (15,074) 5,702 2,436
Income (loss) before income taxes $ (48,313) $ 47,959 $ 52,341