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COMMITMENTS AND CONTINGENCIES - Capital Leases (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Future minimum lease payments, Capital Lease    
2018 $ 32,378  
2019 48,953  
2020 8,866  
2021 966  
2022 917  
Total future minimum lease payments 92,080  
Less: amount representing interest (6,376)  
Present value of future minimum lease payments 85,704  
Less: current portion (28,613) $ (27,196)
Long-term capital lease obligation $ 57,091 $ 85,540