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LEASES - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Lessee, Lease, Description [Line Items] |  |  |
Payments, due | $ 138,641 |  |
Sublease rentals over entire term of sublease | 18,200 |  |
Long-lived asset impairment | 22,351 | $ 0 | $ 0
International |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Long-lived asset impairment | 3,500 |  |
Operating Lease, Right-of-Use-Assets |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Long-lived asset impairment | 16,000 |  |
Operating Lease, Right-of-Use-Assets | International |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Long-lived asset impairment | 10,500 |  |
Finance Lease, Right-of-Use-Assets | International |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Long-lived asset impairment | $ 1,300 |  |
600 West Chicago Lease |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Renewal term | 5 years |  |
Payments, due | $ 66,800 |  |
Minimum | 600 West Chicago Lease |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Rent escalation percentage | 1.00% |  |
Maximum | 600 West Chicago Lease |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Rent escalation percentage | 2.00% |  |

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- Definition Lessee, Operating Lease, Rent Escalation Percentage + References No definition available. + Details
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- Definition Lessor, Sublease Income, To Be Paid + References No definition available. + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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