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Credit Facility and Other Long Term Debt (Tables)
9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Components of Outstanding Debt The Company's outstanding debt consisted of the following:
(In thousands)As of September 30, 2021As of December 31, 2020As of September 30, 2020
1.50% Convertible Senior Notes due 2024$80,919 $500,000 $500,000 
3.25% Senior Notes due 2026600,000 600,000 600,000 
Credit Facility borrowings— — — 
Total principal payments due680,919 1,100,000 1,100,000 
Unamortized debt discount on Convertible Senior Notes(10,105)(79,031)(84,127)
Unamortized debt discount on Senior Notes(1,194)(1,385)(1,448)
Unamortized debt issuance costs - Convertible Senior Notes(1,086)(8,763)(9,403)
Unamortized debt issuance costs - Senior Notes(2,536)(2,940)(3,074)
Unamortized debt issuance costs - Credit facility(3,095)(4,325)(4,601)
Total amount outstanding662,903 1,003,556 997,347 
Less:
Current portion of long-term debt:
Credit Facility borrowings— — — 
Non-current portion of long-term debt$662,903 $1,003,556 $997,347