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Employee Benefit Plans: Components of Net Periodic Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost $ 5,038 $ 5,411 $ 5,383
Interest cost 9,313 13,426 17,374
Expected return on assets (20,876) (22,591) (24,401)
Net amortization of prior service cost 0 0 26
Recognized net actuarial loss (gain) 7,315 8,372 3,763
Net periodic benefit expense 790 4,618 2,145
Supplemental Employee Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 3,149 1,579 4,995
Interest cost 706 1,099 1,295
Expected return on assets 0 0 0
Net amortization of prior service cost 0 2 2
Recognized net actuarial loss (gain) 1,754 1,702 535
Net periodic benefit expense 5,609 4,382 6,827
Supplemental Employee Retirement Plan | Error Correction, Other      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 1,400    
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 2,237 2,056 1,815
Interest cost 1,058 1,649 2,247
Expected return on assets (136) (182) (230)
Net amortization of prior service cost (434) (546) (398)
Recognized net actuarial loss (gain) 466 20 0
Net periodic benefit expense $ 3,191 $ 2,997 $ 3,434