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COMMITMENTS AND CONTINGENCIES - Operating lease commitments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
COMMITMENTS AND CONTINGENCIES      
2019 $ 16,607    
2020 15,075    
2021 13,155    
2022 12,002    
2023 and thereafter 75,758    
Total 132,597    
Rental expense for all operating leases $ 16,195 $ 11,760 $ 10,580