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FINANCING ARRANGEMENTS - Schedule of Convertible Debt Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Instrument [Line Items]
Contractual interest			$ 3,732	$ 4,064
Amortization of debt discount			852	7,123
Total			4,584	11,187
Senior Notes | 3.25% Convertible Senior Notes due 2022
Debt Instrument [Line Items]
Contractual interest	$ 1,700	$ 2,032	3,732	4,064
Amortization of debt discount	549	3,607	852	7,123
Total	$ 2,249	$ 5,639	$ 4,584	$ 11,187

X

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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