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COMMITMENTS AND CONTINGENCIES - Lease Commitments (Details)
$ in Thousands, ft² in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
ft²
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
COMMITMENTS AND CONTINGENCIES      
Area of lease (in square feet) | ft² 2.5    
Obligation for payments under leases      
2019 $ 21,941    
2020 18,813    
2021 12,406    
2022 8,466    
2023 4,142    
Thereafter 5,991    
Total obligations under operating leases 71,759    
Rent expense      
Rent expense $ 21,100 $ 20,900 $ 19,800