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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Deferred Financing Costs (Details) | 12 Months Ended
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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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- 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. + References No definition available. + Details
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