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Financing: Long-Term Debt: Aggregate Maturities of Long Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Less current maturities $ 0 $ 8,436
2023 525,000  
2024 600,000  
2025 0  
2026 300,000  
Thereafter $ 2,735,000