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Long-term Debt (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
December 31, 2020December 31, 2019
Interest RatePrincipalUnamortized Debt CostsTotalPrincipalUnamortized Debt CostsTotal
Debentures:
Senior unsecured notes, maturing 2024, interest rates fixed4.875 %$350 $(2)$348 $350 $(3)$347 
Amended Credit Facility, maturing 2023 to 2024, interest rates variable varies— — — — — — 
Other financing:
Financing leases— — 
Total351 (2)348 351 (3)348 
Less: current portion— — — — — — 
Long-term portion$351 $(2)$348 $351 $(3)$348 
Schedule of Maturities of Long-term Debt [Table Text Block]
The weighted average interest rate for all long-term debt at December 31, 2020, and 2019, was approximately 4.9%. Required repayment of principal for long-term debt is as follows:
Years ending December 31,
2021$— 
2022— 
2023— 
2024350 
2025— 
2026 and after— 
Total$351