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Senior Long-Term Debt And Other Debt (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 18, 2019
Sep. 17, 2019
May 20, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Debt Instrument [Line Items]              
Loss on early extinguishment of debt       $ 17,586 $ 0 $ 0  
Senior long-term debt and other debt       3,534,183 3,009,577    
Senior long-term debt and other debt, estimated fair value       3,907,000 3,030,000    
Interest on senior long-term debt and other debt       $ 169,700 155,400 $ 141,300  
7.125% Unsecured Senior Notes Due September 30, 2019 [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate       7.125%      
Senior long-term debt and other debt, estimated fair value         234,800    
6.25% Unsecured Senior Notes Due September 30, 2020 [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate             6.25%
Debt instrument, repurchased face amount             $ 125,200
Early repayment of senior debt $ 233,400 $ 130,100          
Senior long-term debt and other debt, estimated fair value             $ 224,800
5.35% Unsecured Senior Notes Due June 1, 2021 [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate             5.35%
Debt instrument, repurchased face amount             $ 97,800
Early repayment of senior debt $ 160,200 103,000          
Senior long-term debt and other debt, estimated fair value             $ 152,200
5.0% Unsecured Senior Notes Due May 20 2049 [Member]              
Debt Instrument [Line Items]              
Net proceeds from issuance of unsecured senior notes     $ 592,200        
3.35% Unsecured Senior Notes Due September 17 2029 [Member]              
Debt Instrument [Line Items]              
Net proceeds from issuance of unsecured senior notes   297,500          
4.15% Unsecured Senior Notes Due September 17 2050 [Member]              
Debt Instrument [Line Items]              
Net proceeds from issuance of unsecured senior notes   $ 494,500          
Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Line of credit facility, capacity available       $ 300,000 300,000    
Borrowing capacity increase line of credit facility       $ 200,000      
Line of credit facility, unused capacity, commitment fee percentage       0.20%      
Borrowings outstanding under the facility       $ 0 $ 0    
Secured Letters Of Credit [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Line of credit facility, capacity available       $ 200,000      
Unsecured Senior Notes [Member] | 7.125% Unsecured Senior Notes Due September 30, 2019 [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate       7.125% 7.125%    
Unsecured Senior Notes [Member] | 6.25% Unsecured Senior Notes Due September 30, 2020 [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate       6.25% 6.25%    
Unsecured Senior Notes [Member] | 5.35% Unsecured Senior Notes Due June 1, 2021 [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate       5.35% 5.35%    
Unsecured Senior Notes [Member] | 5.0% Unsecured Senior Notes Due May 20 2049 [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate     5.00%        
Debt instrument, face amount     $ 600,000        
Unsecured Senior Notes [Member] | 3.50% Unsecured Senior Notes Due November 1, 2027 [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate       3.50% 3.50%    
Unsecured Senior Notes [Member] | 4.30% Unsecured Senior Notes Due November 1, 2047 [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate       4.30% 4.30%    
Unsecured Senior Notes [Member] | 5.0% Unsecured Senior Notes Due April 5, 2046 [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate       5.00% 5.00%    
Unsecured Senior Notes [Member] | 7.35% Unsecured Senior Notes Due August 15, 2034 [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate       7.35% 7.35%    
Unsecured Senior Notes [Member] | 3.35% Unsecured Senior Notes Due September 17 2029 [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate   3.35%   3.35% 3.35%    
Debt instrument, face amount   $ 300,000          
Unsecured Senior Notes [Member] | 4.15% Unsecured Senior Notes Due September 17 2050 [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate   4.15%   4.15% 4.15%    
Debt instrument, face amount   $ 500,000          
Other Debt [Member]              
Debt Instrument [Line Items]              
Senior long-term debt and other debt       $ 95,272 $ 102,975    
Other Debt [Member] | Markel Ventures [Member]              
Debt Instrument [Line Items]              
Senior long-term debt and other debt       $ 70,400 $ 78,100    
Minimum [Member] | Other Debt [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate       1.70%      
Maximum [Member] | Other Debt [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate       6.10%