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Debt (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-Term Debt Carrying Amounts
The carrying amounts of long-term debt are as follows:
December 31,
20202019
 (In thousands)
HollyFrontier
2.625% Senior Notes
$350,000 $— 
5.875% Senior Notes
1,000,000 1,000,000 
4.500% Senior Notes
400,000 — 
1,750,000 1,000,000 
Unamortized discount and debt issuance costs(12,885)(6,391)
Total HollyFrontier long-term debt1,737,115 993,609 
HEP
HEP Credit Agreement913,500 965,500 
5.00% Senior Notes
500,000 — 
6.00% Senior Notes
— 500,000 
500,000 500,000 
Unamortized discount and debt issuance costs(7,897)(3,469)
Total HEP long-term debt1,405,603 1,462,031 
Total long-term debt$3,142,718 $2,455,640 

The fair values of the senior notes are as follows:
December 31,
20202019
(In thousands)
HollyFrontier Senior Notes$1,903,867 $1,127,610 
HEP Senior Notes$506,540 $522,045 

These fair values are based on a Level 2 input. See Note 6 for additional information on Level 2 inputs.
Schedule of Principal Maturities of Long-Term Debt
Principal maturities of long-term debt as of December 31, 2020 are as follows:

        
Years Ending December 31,(In thousands)
2021$— 
2022913,500 
2023350,000 
2024— 
2025— 
Thereafter1,900,000 
Total$3,163,500