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COMMITMENTS AND CONTINGENCIES - Future Minimum Rental Payments for Operating Leases (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 15,993
2020 14,807
2021 13,262
2022 12,279
2023 and thereafter 11,084
Total future minimum rental payments for operating leases $ 67,425