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RESTRUCTURING AND FACILITIES CONSOLIDATION INTIATIVES - Components of Restructuring Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring and Related Activities [Abstract]      
Severance and related costs $ 11,179 $ 15,217 $ 8,925
Variable and other facilities-related costs 1,528 1,798 511
Accelerated amortization of lease assets due to cease-use 3,692    
Restructuring and related $ 16,399 $ 17,015 $ 9,436