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Long-Term Debt (Tables)
6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block] The following table summarizes our outstanding debt:
June 30, 2021December 31, 2020
2029 Senior Notes$350 $— 
2024 Senior Notes— 350 
Amended Credit Facility— — 
Financing leases— 
Unamortized debt costs(4)(2)
Total346 348 
Less: current portion— — 
Long-term portion$346 $348