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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Estimated future operating lease expense      
2019 $ 4,102    
2020 3,556    
2021 2,847    
2022 2,286    
2023 2,061    
Thereafter 7,782    
Total 22,634    
Rental expense      
Rental expense $ 3,566 $ 2,935 $ 2,720
Severance Benefit Agreements      
Rental expense      
Period of specified benefits to key employees Upon the subsequent severance of employment 24 months