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SUBSEQUENT EVENTS (Details) - USD ($)		1 Months Ended
	May 06, 2021	Apr. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Apr. 30, 2016
Subsequent Event [Line Items]
Restricted cash			$ 169,785,000	$ 0	$ 206,000	$ 236,000
Senior Notes | 3.25% Convertible Senior Notes due 2022
Subsequent Event [Line Items]
Principal amount			$ 250,000,000	$ 250,000,000			$ 250,000,000.0
Subsequent Event
Subsequent Event [Line Items]
Unrestricted cash used for debt repurchase	$ 58,700,000
Subsequent Event | Senior Notes | 2026 Notes, Additional
Subsequent Event [Line Items]
Principal amount		$ 30,000,000.0
Proceeds from sale of convertible debt, portion used for debt repurchase		$ 25,500,000
Subsequent Event | Senior Notes | 3.25% Convertible Senior Notes due 2022
Subsequent Event [Line Items]
Repurchased debt outstanding principal amount	250,000,000.0
Payments for repurchase of debt	$ 4,000,000.0

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-Publisher FASB
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-SubTopic 30
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-Topic 210
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