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Debt (Tables)
9 Months Ended
Sep. 30, 2020
Debt Instruments [Abstract]  
Schedule of Long-term Debt Instruments
The carrying amounts of our long-term debt was as follows:
September 30,
2020
December 31,
2019
(In thousands)
Credit Agreement
Amount outstanding948,000 $965,500 
6% Senior Notes
Principal— 500,000 
Unamortized premium and debt issuance costs— (3,469)
— 496,531 
5% Senior Notes
Principal500,000 — 
Unamortized premium and debt issuance costs(8,126)— 
491,874 — 
Total long-term debt$1,439,874 $1,462,031