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Long-Term Debt: Aggregate Maturities of Long Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Less current maturities $ 8,436 $ 5,743
2022 0  
2023 525,000  
2024 0  
2025 0  
Thereafter $ 3,035,000