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FINANCING ARRANGEMENTS - Schedule of Convertible Debt Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Debt Instrument [Line Items]        
Contractual interest     $ 4,378 $ 6,096
Amortization of debt discount     1,226 10,824
Total     5,604 16,920
Senior Notes | Convertible senior notes due 2022        
Debt Instrument [Line Items]        
Contractual interest $ 646 $ 2,032 4,378 6,096
Amortization of debt discount 374 3,701 1,226 10,824
Total $ 1,020 $ 5,733 $ 5,604 $ 16,920