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LONG-TERM DEBT - Summary of Long-term Debt (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Apr. 06, 2015
Debt Instrument [Line Items]
Par Value	$ 260,000,000	$ 175,000,000
Unamortized Debt Issuance Cost and Discount	$ (3,685,000)	(1,579,000)
Senior Notes | 5.25% senior notes due April 15, 2025
Debt Instrument [Line Items]
Stated interest rate (percent)	5.25%
Par Value	$ 175,000,000	175,000,000	$ 175,000,000.0
Unamortized Debt Issuance Cost and Discount	(1,291,000)	(1,579,000)
Senior Notes | 4.375% subordinated notes due October 30, 2030
Debt Instrument [Line Items]
Par Value	85,000,000	0
Unamortized Debt Issuance Cost and Discount	$ (2,394,000)	$ 0

X

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Face (par) amount of debt instrument at time of issuance.

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