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FINANCING ARRANGEMENTS (Tables)
12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Convertible Senior Notes
The carrying amount of the 2026 Notes consisted of the following as of December 31, 2023 and 2022 (in thousands):
December 31,
20232022
Principal amount$230,000 $230,000 
Less: debt discount(3,530)(5,077)
Net carrying amount of liability$226,470 $224,923 
Schedule of Interest Costs on Convertible Debt
During the years ended December 31, 2023 and 2022, we recognized interest costs on the 2026 Notes as follows (in thousands):
Year Ended December 31,
20232022
Contractual interest$2,588 $2,588 
Amortization of debt discount1,547 1,520 
Total $4,135 $4,108 
Schedule of Line of Credit Facilities
Amounts committed to outstanding borrowings and letters of credit under the Credit Agreement as of December 31, 2023 and 2022 were as follows (in thousands):
December 31, 2023December 31, 2022
Borrowings$42,776 $75,000 
Letters of credit (1)
25,200 24,900 

(1) Under the Credit Agreement, cash collateral was required if letters of credit extended beyond May 14, 2024. Cash collateral is treated as restricted cash on the Consolidated Balance Sheets. See Note 6, Supplemental Consolidated Balance Sheets and Statements of Operations Information for additional information.