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