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RESTRUCTURING - Restructuring Reserve (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Reserve [Roll Forward]      
Balance at beginning of period $ 1,204 $ 117 $ 202
Accrual/Expense 0 4,263 4,431
Payments (1,204) (3,176) (4,516)
Balance at end of period $ 0 $ 1,204 $ 117