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Benefit Plans Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 260,747 | $ 133,459 |
Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 11,801 | 8,136 |
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 243,521 | 127,610 | $ 133,360
Pension Plan [Member] | Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 86,288 | $ 42,654 |
Actual plan asset allocations as a percent of toal plan assets | 36.00% | 33.00% |
Pension Plan [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 146,210 | $ 77,053 |
Actual plan asset allocations as a percent of toal plan assets | 60.00% | 60.00% |
Pension Plan [Member] | Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 11,023 | $ 7,903 |
Actual plan asset allocations as a percent of toal plan assets | 5.00% | 6.00% |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 17,226 | $ 5,849 | $ 6,804
Other Postretirement Benefits Plan [Member] | Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 5,608 | $ 2,200 |
Actual plan asset allocations as a percent of toal plan assets | 33.00% | 38.00% |
Other Postretirement Benefits Plan [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 10,840 | $ 3,416 |
Actual plan asset allocations as a percent of toal plan assets | 63.00% | 58.00% |
Other Postretirement Benefits Plan [Member] | Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 778 | $ 233 |
Actual plan asset allocations as a percent of toal plan assets | 5.00% | 4.00% |

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