Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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QUARTERLY RESULTS (UNAUDITED) - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 31	$ (136)	$ 18,828
IBM Patent Litigation Case
Restructuring Cost and Reserve [Line Items]
Gain (Loss) Related to Litigation Settlement	$ 40,400	$ 75,000