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Common Shares (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
May 13, 2022
Aug. 02, 2021
Dec. 31, 2022
Apr. 28, 2023
Mar. 31, 2023
Number of common and preferred stock authorized to issue         185,000
Common shares, authorized     175,000   175,000
Preferred shares, authorized         10,000
Common Stock, Shares, Outstanding         106,800
Preferred Stock, Shares Outstanding         0
2021 ATM program          
Maximum aggregate offering price of remaining common shares available for sale $ 71,300        
Maximum aggregate offering price of common shares   $ 500,000      
Stock Issued During Period, Value, New Issues     $ 26,200    
Stock Issued During Period, Shares, New Issues     200    
AveragePricePerCommonShareSold     $ 165.01    
2022 ATM program          
Maximum aggregate offering price of common shares $ 500,000        
2022 ATM program | Subsequent Event [Member]          
Maximum aggregate offering price of remaining common shares available for sale       $ 500,000  
April 2007 Repurchase Plan [Member]          
Treasury stock allowed for repurchase         $ 500,000
October 2022 Repurchase Plan | Subsequent Event [Member]          
Share Repurchase Program, Remaining Authorized Repurchase Amount       $ 500,000