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LEASES (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Other noncurrent assets:      
Operating lease right of use assets $ 4,290 $ 5,462  
Current liabilities:      
Accounts payable and accrued liabilities 111,909 157,763 $ 157,848
Operating lease liabilities 1,625 2,103  
Other noncurrent liabilities:      
Operating lease liabilities $ 2,748 3,444  
Lessee, Operating Lease, Existence of Option to Extend [true false] true    
Renewal term 1 year    
Lease cost      
Operating lease costs $ 1,288    
Short-term lease costs 9,666    
Variable lease costs 771    
Total lease costs 11,725    
Other information      
Operating cash flows from operating leases 1,290    
Right-of-use assets obtained in exchange for new operating lease liabilities $ 5,462    
Weighted-average remaining lease term - operating leases 3 years 7 months 6 days    
Weighted-average discount rate - operating leases 4.83%    
Minimum      
Other noncurrent liabilities:      
Initial lease term 1 year    
Maximum      
Other noncurrent liabilities:      
Initial lease term 5 years    
As reported under ASC 840 | Leases      
Current liabilities:      
Accounts payable and accrued liabilities     $ 157,848
Impact of adoption of ASC 842 | Leases      
Other noncurrent assets:      
Operating lease right of use assets   5,462  
Current liabilities:      
Accounts payable and accrued liabilities   (85)  
Operating lease liabilities   2,103  
Other noncurrent liabilities:      
Operating lease liabilities   $ 3,444