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LEASES (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Other noncurrent assets:      
Operating lease right of use assets $ 4,879 $ 5,462  
Current liabilities:      
Accounts payable and accrued liabilities 137,016 157,763 $ 157,848
Operating lease liabilities 1,868 2,103  
Other noncurrent liabilities:      
Operating lease liabilities $ 3,095 3,444  
Lessee, Operating Lease, Existence of Option to Extend [true/false] true    
Renewal term 1 year    
Lease cost      
Operating lease costs $ 644    
Short-term lease costs 5,718    
Variable lease costs 425    
Total lease costs 6,787    
Other information      
Operating cash flows from operating leases 1,229    
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