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COMMITMENTS, CONTINGENCIES AND REGULATORY MATTERS - Lease Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Lessee, Lease, Description [Line Items]        
Cash used in operating activities for amounts included in the measurement of lease liabilities $ 3,496 $ 3,771 $ 10,254 $ 12,228
Short-term (twelve months or less) lease costs 699 1,539 3,126 3,848
Selling, general and administrative expense        
Lessee, Lease, Description [Line Items]        
Operating lease costs 2,566 1,752 7,376 8,368
Cost of revenue        
Lessee, Lease, Description [Line Items]        
Operating lease costs $ 479 $ 567 $ 1,748 $ 2,279