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LONG-TERM DEBT - 5 1/2% Senior Notes (Details) - USD ($)		12 Months Ended
	Aug. 01, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Gain (loss) on extinguishment of debt		$ (1,481,000)	$ (1,676,000)	$ (2,493,000)
5½% Senior Notes | Senior Notes
Stated interest rate		5.50%
Early repayment of senior debt	$ 300,000,000.0
Debt Instrument, redemption price, percentage	100.00%
Gain (loss) on extinguishment of debt			$ (1,700,000)

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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