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Long-term Debt (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 15, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Debt Instrument [Line Items]            
Loss on early extinguishment of Debt   $ 0 $ 0 $ 7,545 $ 0  
Cash costs of 4.10% senior notes redemption       7,099 $ 0  
Long-term debt   $ 1,008,516   $ 1,008,516   $ 1,139,287
2.70% Senior Notes [Member]            
Debt Instrument [Line Items]            
Senior notes, interest rate   2.70%   2.70%   2.70%
Principal amount of debt   $ 400,000   $ 400,000    
Long-term debt   $ 392,516   $ 392,516   $ 391,853
3.78% Senior Notes [Member]            
Debt Instrument [Line Items]            
Senior notes, interest rate   3.78%   3.78%   3.78%
Long-term debt   $ 250,000   $ 250,000   $ 250,000
4.10% Senior Notes [Member]            
Debt Instrument [Line Items]            
Senior notes, interest rate 4.10%         4.10%
Principal amount of debt $ 350,000          
Redemption price percentage 100.00%          
Loss on early extinguishment of Debt       7,500    
Cash costs of 4.10% senior notes redemption       7,100    
Write off of deferred debt issuance cost       400    
Long-term debt   0   0   $ 349,434
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity   900,000   $ 900,000    
Debt instrument, term       5 years    
Average interest rate during the period       2.70%   1.60%
Long-term debt   366,000   $ 366,000   $ 148,000
Outstanding letters of credit   2,000   2,000   2,000
Unused portion of revolving credit facility   $ 532,000   $ 532,000   $ 750,000