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LEASE COST (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Lease Cost Table Line Items |  |  |  |
Total lease cost | $ 13,972 | $ 14,538 | $ 29,488 | $ 29,651
Depreciation and Amortization |  |  |  |
Lease Cost Table Line Items |  |  |  |
Amortization of ROU assets - finance leases | 1,710 | 1,928 | 3,514 | 3,844
Interest Expense |  |  |  |
Lease Cost Table Line Items |  |  |  |
Interest on lease liabilities - finance leases | 36 | 52 | 76 | 108
Cost of Services |  |  |  |
Lease Cost Table Line Items |  |  |  |
Operating lease cost (cost resulting from lease payments) | 10,101 | 11,642 | 20,540 | 23,680
Short-term Lease, Cost | 1,001 | 883 | 1,967 | 1,880
Variable Lease, Cost | 319 | (284) | 637 | (284)
Selling General And Administrative Expenses |  |  |  |
Lease Cost Table Line Items |  |  |  |
Operating lease cost (cost resulting from lease payments) | 721 | 858 | 1,327 | 1,400
Sublease Income | (214) | (212) | (442) | (394)
Restructuring |  |  |  |
Lease Cost Table Line Items |  |  |  |
Operating lease cost (cost resulting from lease payments) | 401 |  | 641 |
Impairment |  |  |  |
Lease Cost Table Line Items |  |  |  |
Operating lease cost (cost resulting from lease payments) | 223 |  | 1,920 |
Other income (expense), net |  |  |  |
Lease Cost Table Line Items |  |  |  |
Operating lease cost (cost resulting from lease payments) | 310 | 287 | 620 | 529
Sublease Income | $ (636) | $ (616) | $ (1,312) | $ (1,112)

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- Definition Amount of variable lease cost net. + References No definition available. + Details
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- Definition Amount of interest expense on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 + Details
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- Definition Amount of amortization expense attributable to right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 + Details
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- Definition Amount of lease cost recognized by lessee for lease contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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