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COMMITMENTS AND CONTINGENCIES - Lease Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]      
Total lease payments $ 20,800 $ 22,600 $ 23,700
Operating Leases, Future Minimum Payments Due [Abstract]      
2018 4,648    
2019 3,243    
2020 605    
2021 0    
2022 0    
2023 and thereafter $ 0