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Employee Benefit Plans, Fair Values of Pension Plan Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value of Pension Plan Assets [Abstract] |  |  |  |
Period to keep distributions in immediately available funds |  | 1 year |  |
Defined Benefit Pension Plans Combined [Member] |  |  |  |
Fair Value of Pension Plan Assets [Abstract] |  |  |  |
Fair value of plan assets |  | $ 63,578 | $ 55,807 | $ 65,584
Defined Benefit Pension Plans Combined [Member] | Cash and Money Market Funds [Member] |  |  |  |
Fair Value of Pension Plan Assets [Abstract] |  |  |  |
Fair value of plan assets | [1] | 53,490 | 6,108 |
Defined Benefit Pension Plans Combined [Member] | Common Equity Securities [Member] |  |  |  |
Fair Value of Pension Plan Assets [Abstract] |  |  |  |
Fair value of plan assets | [2] | 0 | 17,792 |
Defined Benefit Pension Plans Combined [Member] | Equity Mutual Funds [Member] |  |  |  |
Fair Value of Pension Plan Assets [Abstract] |  |  |  |
Fair value of plan assets | [3] | 10,065 | 13,542 |
Defined Benefit Pension Plans Combined [Member] | Fixed Income Mutual Funds [Member] |  |  |  |
Fair Value of Pension Plan Assets [Abstract] |  |  |  |
Fair value of plan assets | [4] | 23 | 18,365 |
Defined Benefit Pension Plans Combined [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Fair Value of Pension Plan Assets [Abstract] |  |  |  |
Fair value of plan assets |  | 63,578 | 55,807 |
Defined Benefit Pension Plans Combined [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash and Money Market Funds [Member] |  |  |  |
Fair Value of Pension Plan Assets [Abstract] |  |  |  |
Fair value of plan assets | [1] | 53,490 | 6,108 |
Defined Benefit Pension Plans Combined [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Common Equity Securities [Member] |  |  |  |
Fair Value of Pension Plan Assets [Abstract] |  |  |  |
Fair value of plan assets | [2] | 0 | 17,792 |
Defined Benefit Pension Plans Combined [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Mutual Funds [Member] |  |  |  |
Fair Value of Pension Plan Assets [Abstract] |  |  |  |
Fair value of plan assets | [3] | 10,065 | 13,542 |
Defined Benefit Pension Plans Combined [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income Mutual Funds [Member] |  |  |  |
Fair Value of Pension Plan Assets [Abstract] |  |  |  |
Fair value of plan assets | [4] | $ 23 | $ 18,365 |
[1] | The portfolios are designed to keep up to one year of distributions in immediately available funds. The Company was more heavily-weighted in cash as of December 31, 2023 due to the timing of the change in the investment policy statements and as of December 31, 2022 due to the timing of employer contributions and market volatility.
[2] | This category included investments in U.S. common stocks and foreign stocks trading in the U.S. widely distributed among consumer discretionary, consumer staples, energy, financials, health care, industrials, information technology, materials, real estate, telecommunication, and utilities.
[3] | This category currently includes a majority of investments in exchange traded funds as well as domestic equity mutual funds and international mutual funds which give the portfolio exposure to mid and large cap index funds as well as international diversified index funds.
[4] | This category includes fixed income investments in mutual funds which include government and corporate securities of both the U.S. and other countries. The non-U.S. corporate and sovereign investments add further diversity to the fixed income portion of the portfolio.

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