RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Components of Restructuring Expense (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Restructuring and Related Activities [Abstract]
Severance and related costs	$ 1,771	$ 4,919
Variable and other facilities-related costs	234	13
Accelerated amortization of lease assets due to cease-use	70	0
Restructuring and related expense	$ 2,075	$ 4,932

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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