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Pension and Postretirement Plans (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Investment
companies
Mar. 31, 2020
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Investment
companies
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Investment
Defined Benefit Plan Disclosure [Line Items]            
Special separation benefit expense       $ 6,014    
Defined Benefit Pension Plan [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Special separation benefit expense $ 6,014   $ 6,607 $ 6,014 $ 6,607  
Percent of plan assets managed internally by the company       39.00%    
Percent of plan assets managed by investment companies       61.00%    
Number of investment companies actively managing plan assets | companies 2     2    
Percentage of total plan assets 100.00%     100.00%   100.00%
Berkshire Hathaway Common Stock [Member] | Defined Benefit Pension Plan [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] | Defined Benefit Pension Plan [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] | Defined Benefit Pension Plan [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] | Defined Benefit Pension Plan [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] | Defined Benefit Pension Plan [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 Pension Plan [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Percentage of total plan assets 16.00%     16.00%   7.00%
Single Equity Concentration [Member] | Defined Benefit Pension Plan [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 $ 624,500     $ 624,500   $ 704,800
Percentage of total plan assets 28.00%     28.00%   30.00%
Single Equity Concentration [Member] | Equity Securities [Member] | Defined Benefit Pension Plan [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 Pension Plan [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    
Single Equity Concentration [Member] | Equity Funds [Member] | Defined Benefit Pension Plan [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
Concentration In Single Entity, Type Of Industry, Foreign Country Or Individual Fund [Member] | Defined Benefit Plan Assets Total [Member] | Defined Benefit Pension Plan [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Minimum percentage of plan assets considered as significant concentrations in pension plans       10.00%    
Education [Member] | Defined Benefit Pension Plan [Member] | Separation Incentive Program [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Special separation benefit expense     $ 6,600      
Education and SocialCode [Member] | Defined Benefit Pension Plan [Member] | Separation Incentive Program [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Special separation benefit expense $ 6,000