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RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Narrative (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($) executive	Sep. 30, 2019 USD ($) employee	Sep. 30, 2020 USD ($) executive employee	Sep. 30, 2019 USD ($) employee	Dec. 31, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and related	$ 3,290		$ 2,372	$ 10,726	$ 16,448
Severance and related costs	1,789		$ 719	8,276	$ 11,619
Long-term portion of accrued restructuring	800			800		$ 900
2020 Restructuring Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring and related	2,900			8,690
Severance and related costs		$ 1,100
Restructuring and related cost, expected cost	6,000			6,000
2020 Restructuring Initiative | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and related				$ 7,691
Number of positions eliminated | employee				125
2020 Restructuring Initiative | Severance | Executives
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | executive		3		3
2020 Restructuring Initiative | Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring and related				$ 999
2019 Restructuring Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring and related				$ 2,196
Number of positions eliminated | employee			20	5	130
Restructuring charges, net of adjustments	$ 400		$ 1,800	$ 2,100	$ 7,800
2019 Restructuring Initiative | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and related				723
Restructuring charges, net of adjustments			700	600	6,500
2019 Restructuring Initiative | Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring and related				1,473
Restructuring charges, net of adjustments			$ 1,700	1,500	4,700
Merger Restructuring Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring and related				$ (100)	$ 5,200
Number of positions eliminated | employee				40

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