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Employee Benefit Plans (Fair Value and Allocation Of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 1,345,340 | $ 1,235,555 | $ 976,072
Actual % of Plan Assets | 100.00% | 100.00% |
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 840,518 | $ 991,128 |
Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 504,822 | 244,427 |
Fair Value, Inputs, Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Cash and equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 16,674 | $ 37,913 |
Actual % of Plan Assets | 1.00% | 3.00% |
Cash and equivalents | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 0.00% |  |
Cash and equivalents | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 5.00% |  |
Cash and equivalents | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 16,674 | $ 37,913 |
Cash and equivalents | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Cash and equivalents | Fair Value, Inputs, Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 76,240 | $ 144,924 |
Actual % of Plan Assets | 61.00% | 77.00% |
Equity securities | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 30.00% |  |
Equity securities | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 70.00% |  |
Equity securities | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 76,240 | $ 144,924 |
Equity securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Equity securities | Fair Value, Inputs, Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Equity mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 481,630 | 559,472 |
Equity mutual funds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 481,630 | 559,472 |
Equity mutual funds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Equity mutual funds | Fair Value, Inputs, Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Exchange Traded Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 263,072 | 248,819 |
Exchange Traded Funds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 263,072 | 248,819 |
Exchange Traded Funds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Exchange Traded Funds | Fair Value, Inputs, Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 0 | $ 0 |
Debt Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actual % of Plan Assets | 38.00% | 20.00% |
Debt Securities | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 15.00% |  |
Debt Securities | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 45.00% |  |
US government and government agency securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 228,399 | $ 90,292 |
US government and government agency securities | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
US government and government agency securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 228,399 | 90,292 |
US government and government agency securities | Fair Value, Inputs, Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Corporate Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 279,325 | 154,135 |
Corporate Bonds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 2,902 | 0 |
Corporate Bonds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 276,423 | 154,135 |
Corporate Bonds | Fair Value, Inputs, Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 0 | $ 0 |

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