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LEASES - Financial Impact of Leases (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement of Financial Position |  |  |
Right-of-use assets | $ 52,331 | $ 70,635 |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:LongTermRightOfUseAssetsMember | us-gaap:LongTermRightOfUseAssetsMember |
Finance lease assets | $ 302 | $ 213 |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Property Plant And Equipment [Member] |  |
Operating lease liabilities | $ 14,019 | 19,315 |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | wttr:CurrentOperatingLeaseLiabilitiesMember |  |
Operating lease liabilities | $ 60,984 | 72,143 |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | wttr:LongTermOperatingLeaseLiabilitiesMember |  |
Finance lease liabilities | $ 307 | 128 |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] | Finance Lease, Liability |  |
Finance lease liabilities | $ 94 | 87 |
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | wttr:OtherLongTermLliabilitiesMember |  |
Right-of-use asset impairment | $ 3,600 | 600 |
Operating lease cost: |  |  |
Operating lease cost - fixed | 19,968 | 27,856 |
Lease abandonment costs | 4,350 | 2,073 |
Short-term agreements: | 44,062 | 93,949 |
Finance lease cost: |  |  |
Amortization of leased assets | 314 | 916 | $ 1,314
Interest on lease liabilities | 14 | 32 |
Sublease income | 1,463 | 1,544 |
Lessor income | 350 | 478 |
Statement of cash flows |  |  |
Cash paid for operating leases | 22,385 | 30,670 |
Cash paid for finance leases lease interest | 14 | 32 |
Cash paid for finance leases | $ 264 | $ 883 | $ 1,881

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