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CAPITAL LEASE (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Capital lease of assets      
Loss on transaction   $ 6,500  
Finance leasing contract term 2 years    
Finance leasing contract carrying amount $ 23,000    
Future minimum lease payments required under non-cancelable capital lease agreements      
2019   40,945  
2020   23,483  
2021   11,842  
2022 and thereafter   556  
Total minimum lease payments   76,826  
Less: amount representing interest   5,024  
Present value of net minimum lease payments   71,802  
Current portion   37,549  
Non-current portion   34,253  
Machinery      
Capital lease of assets      
Leased assets gross   121,938 $ 131,624
Accumulated depreciation   (40,455) (46,727)
Leased assets net   $ 81,483 $ 84,897
Minimum      
Capital lease of assets      
Lease terms   2 years  
Maximum      
Capital lease of assets      
Lease terms   4 years