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LEASES - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
ft²
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
ft²
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]          
Additional amortization expense $ 0 $ 601 $ 70 $ 3,459  
Variable lease costs $ 697 1,727 $ 1,969 2,932 $ 1,000
North Dallas, Texas          
Lessee, Lease, Description [Line Items]          
Square feet under lease | ft² 107,800   107,800    
Facilities          
Lessee, Lease, Description [Line Items]          
Accrual for future anticipated variable lease costs $ 800   $ 800   900
2019 Restructuring Initiative          
Lessee, Lease, Description [Line Items]          
Accrual for future anticipated variable lease costs 1,318   1,318   3,101
2019 Restructuring Initiative | Facilities          
Lessee, Lease, Description [Line Items]          
Additional amortization expense   $ 600 100 $ 3,500 3,700
Accrual for future anticipated variable lease costs $ 799   $ 799   $ 991