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Employee Benefit Plans: Projected Benefit Plan Payments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Pension Plans, Defined Benefit  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2019 $ 24,405
2020 25,847
2021 26,951
2022 27,972
2023 29,002
2024-2028 151,915
Supplemental Employee Retirement Plans, Defined Benefit  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2019 1,463
2020 1,406
2021 1,617
2022 1,727
2023 1,912
2024-2028 12,208
Other Postretirement Benefit Plans, Defined Benefit  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2019 4,898
2020 5,545
2021 5,695
2022 5,849
2023 5,607
2024-2028 $ 24,953