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LEASES - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	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%

X

- 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
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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

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X

- 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
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