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DEBT - Convertible Debt (Details)				3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($)	Jan. 31, 2020 USD ($)	Mar. 19, 2019 USD ($) day $ / shares	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jan. 16, 2013 USD ($)
Debt Instrument [Line Items]
Repayment of debt					$ 0	$ 114,994,000	$ 152,250,000
Loss on redemption of convertible debt					0	0	3,044,000
Amortized value					366,984,000	437,637,000
Proceeds from issuance of debt					$ 0	$ 3,087,000	$ 0
2013 Notes | Senior Notes
Debt Instrument [Line Items]
Face amount								$ 265,000,000
Interest rate, stated percentage								2.875%
Repurchased face amount			$ 150,000,000
Repayment of debt		$ 49,000	152,200,000	$ 115,500,000
Repurchased amount			148,000,000
Loss on redemption of convertible debt			3,000,000
Amortized value			149,200,000
Loss on redemption of convertible debt, recovery			$ 400,000
Debt conversion	$ 2,000	$ 4,000
2013 Notes | Senior Notes | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow
Debt Instrument [Line Items]
Measurement input			0.0495
2019 Notes | Senior Notes
Debt Instrument [Line Items]
Face amount			$ 230,000,000
Interest rate, stated percentage			2.50%
Proceeds from issuance of debt			$ 222,900,000
Commissions and expenses related to offering of debt			$ 7,100,000
Convertible, conversion ratio			0.0541082
Convertible, conversion price (in dollars per share) | $ / shares			$ 18.48
Convertible, threshold trading days | day			20
Convertible, threshold consecutive trading days | day			30
Convertible, threshold percentage of stock price trigger			130.00%

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Gain (Loss) on Repurchase of Debt Instrument, Tax Expense (Benefit)

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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

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