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Income Taxes: Net Operating Loss Carryforwards (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Loss Carryforwards [Line Items]      
Deferred Income Tax Expense (Benefit) $ 38,091 $ 38,020 $ (24,239)
Deferred Tax Assets, Operating Loss Carryforwards, State and Local 9,914 $ 13,537  
Internal Revenue Service (IRS)      
Operating Loss Carryforwards [Line Items]      
Operating Loss Carryforwards 378,236    
Operating Loss Carryforwards, With no Expiration Date 79,644    
State and Local Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Operating Loss Carryforwards 173,867    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 1,300    
State and Local Jurisdiction | Valuation Allowance, Operating Loss Carryforwards      
Operating Loss Carryforwards [Line Items]      
Operating Loss Carryforwards Valuation Allowance 1,100    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 800    
Valuation Allowance Reduction due to Expired NOL 200    
Deferred Income Tax Expense (Benefit) 800    
Deferred Tax Assets, Operating Loss Carryforwards, State and Local $ 200