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LEASES - Financial Impact of Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Statement of Financial Position        
Operating lease assets $ 75,302 $ 75,302    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:LongTermRightOfUseAssetsMember us-gaap:LongTermRightOfUseAssetsMember    
Finance lease assets $ 422 $ 422    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property Plant And Equipment [Member] Property Plant And Equipment [Member]    
Operating lease liabilities $ 19,553 $ 19,553    
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] wttr:CurrentOperatingLeaseLiabilitiesMember wttr:CurrentOperatingLeaseLiabilitiesMember    
Operating lease liabilities $ 75,169 $ 75,169    
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] wttr:LongTermOperatingLeaseLiabilitiesMember wttr:LongTermOperatingLeaseLiabilitiesMember    
Finance lease liabilities $ 421 $ 421   $ 938
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Finance lease liabilities Finance lease liabilities    
Finance lease liabilities $ 129 $ 129    
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] wttr:OtherLongTermLliabilitiesMember wttr:OtherLongTermLliabilitiesMember    
Lease, Cost [Abstract]        
Operating lease cost - fixed $ 7,091 $ 15,150    
Lease abandonment costs 183 1,256    
Short-term agreements: 24,914 47,812    
Finance lease cost:        
Amortization of leased assets 523 737    
Interest on lease liabilities 3 7    
Sublease income 390 762    
Lessor income 69 180    
Statement of cash flows        
Cash paid for operating leases 7,606 15,957    
Cash paid for finance leases lease interest 3 7    
Cash paid for finance leases $ 264 $ 549 $ 1,029