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COMMITMENTS AND CONTINGENCIES (Future Minimum Rental Payments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2018 $ 39,359    
2019 27,739    
2020 20,175    
2021 15,517    
2022 10,111    
Thereafter 25,600    
Total minimum lease payments 138,501    
Operating lease expense $ 37,916 $ 28,220 $ 20,065