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 |