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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Estimated future operating lease expense      
2018 $ 2,915    
2019 2,353    
2020 1,414    
2021 1,022    
2022 854    
Thereafter 1,394    
Total 9,952    
Rental expense      
Rental expense $ 2,935 $ 2,720 $ 1,946
Severance Benefit Agreements      
Rental expense      
Period of specified benefits to key employees Upon the subsequent severance of employment 24 months