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LEASES - Additional Information (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
Lessee, Lease, Description [Line Items] |  |  |
Right-of-use lease assets | $ 262,355 |  |
Lease liabilities | $ 270,622 |  |
Weighted average remaining lease term, excluding Chicago office space (in years) | 4 years 3 months 18 days |  |
ASU No. 2016-02 |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Right-of-use lease assets |  | $ 265,400 |
Lease liabilities |  | $ 273,300 |
Chicago Office Space |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease term (in years) |  |  | 15 years

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- Definition Operating Lease, Excluding Longest Term, Weighted Average Remaining Lease Term + References No definition available. + 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 Term of lessee's operating lease, 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=77888426&loc=SL77918673-209980 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Details
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