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Fair Value of Financial Instruments (Carrying Values and Fair Values of Debt Instruments) (Details) - Senior Notes [Member] - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Mar. 09, 2022
Dec. 31, 2021
Senior Notes due 2028 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes $ 500,000   $ 500,000
Fair value of senior notes [1] $ 505,500   $ 561,350
Interest rate 4.25%   4.25%
Senior note year due 2028    
Senior Notes due 2029 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes $ 500,000   $ 500,000
Fair value of senior notes [1] $ 470,200   $ 539,500
Interest rate 3.50%   3.50%
Senior note year due 2029    
Senior Notes due 2030 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes $ 600,000   $ 600,000
Fair value of senior notes [1] $ 524,820   $ 610,440
Interest rate 2.60%   2.60%
Senior note year due 2030    
Senior Notes due 2032 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes $ 650,000   $ 650,000
Fair value of senior notes [1] $ 532,675   $ 637,065
Interest rate 2.20%   2.20%
Senior note year due 2032    
New Senior Note due 2032 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes $ 500,000    
Fair value of senior notes [1] $ 444,200    
Interest rate 3.20% 3.20%  
Senior note year due 2032    
Senior Notes due 2050 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes $ 500,000   $ 500,000
Fair value of senior notes [1] $ 366,200   $ 496,350
Interest rate 3.05%   3.05%
Senior note year due 2050    
Senior Notes due 2052 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes $ 850,000   $ 850,000
Fair value of senior notes [1] $ 608,855   $ 828,580
Interest rate 2.95%   2.95%
Senior note year due 2052    
[1] Senior Notes are classified as Level 2 within the fair value hierarchy. Fair value inputs include third-party calculations of the market interest rate of notes with similar ratings in similar industries over the remaining note terms.