Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.

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LONG-TERM DEBT - Convertible Senior Notes Narrative (Details) - USD ($)	1 Months Ended	12 Months Ended
	Apr. 30, 2012	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Borrowings under term loan credit facility, net of original issuance discount		$ 148,500,000	$ 0	$ 0
Equity component of convertible senior notes repurchase				35,519,000
Loss on debt extinguishment		$ 396,000	$ 165,000	280,000
Convertible senior notes due 2018
Debt Instrument [Line Items]
Debt instrument convertible conversion amount settled over principal				80,200,000
Debt conversion, converted instrument, amount				44,600,000
Equity component of convertible senior notes repurchase				35,500,000
Loss on debt extinguishment				$ 200,000
Convertible senior notes due 2018
Debt Instrument [Line Items]
Debt instrument, face amount	$ 150,000,000
Notes issued, interest rate	3.375%
Borrowings under term loan credit facility, net of original issuance discount	$ 145,100,000