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Long-Term Debt: Amortization Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]      
Deferred Finance Costs Remaining, Noncurrent $ 24,809    
Amortization expense for deferred financing costs $ 3,272 $ 3,242 $ 2,829