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Benefit Plans Pension Fair Value Assets - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 1,093,784 | $ 964,774 | $ 862,951
Defined Benefit Plan, Fair Value of Plan Assets excluding assets recorded at Net Asset Value | 998,316 | 900,439 |
Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 166,614 | 104,144 |
Company Stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 3,767 | 2,620 |
U.S. Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 37,927 | 37,130 |
International Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 124,336 | 115,757 |
Emerging Markets Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 132,069 | 111,794 |
Fixed Income Securities, Corporate and Government Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 92,085 | 84,020 |
Fixed Income Mutual Funds, Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 44,848 | 38,945 |
Fixed Income Mutual Funds, Core Bond |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 136,172 | 178,589 |
Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 132,953 | 109,765 |
Real Asset Mutual Funds, Commodities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 53,088 | 47,697 |
Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 43,060 | 39,275 |
Other Types of Investments, Global Allocation Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 12,359 | 12,269 |
Other Types of Investments Insurance linked securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 19,038 | 18,434 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets excluding assets recorded at Net Asset Value | 801,040 | 701,454 |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 166,614 | 104,144 |
Fair Value, Inputs, Level 1 [Member] | Company Stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 3,767 | 2,620 |
Fair Value, Inputs, Level 1 [Member] | U.S. Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 7,467 | 7,245 |
Fair Value, Inputs, Level 1 [Member] | International Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 83,309 | 62,569 |
Fair Value, Inputs, Level 1 [Member] | Emerging Markets Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 131,103 | 110,972 |
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities, Corporate and Government Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 92,085 | 84,020 |
Fair Value, Inputs, Level 1 [Member] | Fixed Income Mutual Funds, Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Fixed Income Mutual Funds, Core Bond |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 72,061 | 116,629 |
Fair Value, Inputs, Level 1 [Member] | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 117,089 | 95,580 |
Fair Value, Inputs, Level 1 [Member] | Real Asset Mutual Funds, Commodities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 53,088 | 47,697 |
Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 43,060 | 39,275 |
Fair Value, Inputs, Level 1 [Member] | Other Types of Investments, Global Allocation Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 12,359 | 12,269 |
Fair Value, Inputs, Level 1 [Member] | Other Types of Investments Insurance linked securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 19,038 | 18,434 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets excluding assets recorded at Net Asset Value | 195,483 | 197,499 |
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Company Stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | U.S. Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 30,460 | 29,885 |
Fair Value, Inputs, Level 2 [Member] | International Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 41,027 | 53,188 |
Fair Value, Inputs, Level 2 [Member] | Emerging Markets Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 966 | 822 |
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities, Corporate and Government Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Fixed Income Mutual Funds, Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 43,055 | 37,459 |
Fair Value, Inputs, Level 2 [Member] | Fixed Income Mutual Funds, Core Bond |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 64,111 | 61,960 |
Fair Value, Inputs, Level 2 [Member] | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 15,864 | 14,185 |
Fair Value, Inputs, Level 2 [Member] | Real Asset Mutual Funds, Commodities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Other Types of Investments, Global Allocation Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Other Types of Investments Insurance linked securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets excluding assets recorded at Net Asset Value | 1,793 | 1,486 |
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Company Stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | U.S. Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | International Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Emerging Markets Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities, Corporate and Government Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Fixed Income Mutual Funds, Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 1,793 | 1,486 | $ 1,461
Fair Value, Inputs, Level 3 [Member] | Fixed Income Mutual Funds, Core Bond |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Real Asset Mutual Funds, Commodities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Other Types of Investments, Global Allocation Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Other Types of Investments Insurance linked securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fair Value Measured at Net Asset Value Per Share | International Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Net Asset Value Assets | 2,930 | 3,288 |
Fair Value Measured at Net Asset Value Per Share | Emerging Markets Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Net Asset Value Assets | 7,262 | 6,650 |
Fair Value Measured at Net Asset Value Per Share | Hedge Funds, Multi-strategy [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 85,276 | $ 54,397 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their net asset value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References No definition available. + Details
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