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Pension and Postretirement Plans (Narrative) (Details) - Defined Benefit Pension Plan [Member]
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
investment
company
Mar. 31, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
investment
company
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
investment
Defined Benefit Plan Disclosure [Line Items]            
Special separation benefit expense $ 5,517   $ 0 $ 9,646 $ 0  
Percent of plan assets managed internally by the company       41.00%    
Percent of plan assets managed by investment companies       59.00%    
Number of investment companies actively managing plan assets | company 2     2    
Percentage of total plan assets 100.00%     100.00%   100.00%
Berkshire Hathaway Common Stock [Member] | Investment Manager 2 [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Defined benefit plan, target allocation maximum percentage of assets, singular equity security, without prior approval by plan administrator       20.00%    
Alphabet and Berkshire Hathaway Common Stock [Member] | Investment Manager 1 [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Defined benefit plan, target allocation maximum percentage of assets, singular equity security, without prior approval by plan administrator       15.00%    
Foreign Investments [Member] | Maximum [Member] | Investment Manager 1 [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Defined benefit plan, target allocation percentage of assets 30.00%     30.00%    
Foreign Investments [Member] | Maximum [Member] | Investment Manager 2 [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Defined benefit plan, target allocation percentage of assets 15.00%     15.00%    
Fixed income securities [Member] | Minimum [Member] | Investment Manager 2 [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Defined benefit plan, target allocation percentage of assets 10.00%     10.00%    
Private investment fund [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Percentage of total plan assets 17.00%     17.00%   16.00%
Single Equity Concentration [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Defined benefit plan, target allocation maximum percentage of assets, singular equity security, without prior approval by plan administrator       10.00%   10.00%
Value of investments $ 946,400     $ 946,400   $ 842,600
Percentage of total plan assets 34.00%     34.00%   33.00%
Single Equity Concentration [Member] | Equity Securities [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Number of investments the company's pension plan held which individually exceed 10% of total plan assets | investment 1     1   1
Single Equity Concentration [Member] | Private investment fund [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Number of investments the company's pension plan held which individually exceed 10% of total plan assets | investment 1     1   1
Concentration In Single Entity, Type Of Industry, Foreign Country Or Individual Fund [Member] | Defined Benefit Plan Assets Total [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Minimum percentage of plan assets considered as significant concentrations in pension plans       10.00%    
Leaf Group and Code3 [Member] | Separation Incentive Program [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Special separation benefit expense   $ 4,100        
Kaplan, Graham Media Group, Leaf Group, Code3 and Pinna [Member] | Separation Incentive Program [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Special separation benefit expense $ 5,500