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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Deferred Financing Costs (Details)	12 Months Ended
	Dec. 31, 2020
5.25% senior notes due April 15, 2025 | Senior Notes
Debt Instrument [Line Items]
Term of debt instrument	8 years
4.375% subordinated notes due October 30, 2030 | Subordinated Notes
Debt Instrument [Line Items]
Term of debt instrument	10 years

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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.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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