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Financing: Long-Term Debt: Amortization Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]      
Deferred Financing Costs $ 26,878 $ 24,809  
Amortization expense for deferred financing costs $ 3,769 $ 3,272 $ 3,242