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RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
employee
executive
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Restructuring Cost and Reserve [Line Items]      
Restructuring and related $ 2,075 $ 4,932  
Accelerated rent amortization 70 0  
Long-term portion of accrued restructuring     $ 900
ECI Executive Severance | Severance      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related $ 1,100    
Number of positions eliminated | executive 3    
2019 Restructuring Initiative      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related $ 959    
2019 Restructuring Initiative | Severance      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related $ 655    
Number of positions eliminated | employee 5    
2019 Restructuring Initiative | Facilities      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related $ 304    
Accelerated rent amortization $ 100   $ 3,700
Merger Restructuring Initiative      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related   $ 4,900  
Number of positions eliminated | employee 40