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Shareholders' Equity Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
May 07, 2021
Feb. 24, 2021
Class of Stock [Line Items]          
Proceeds from Issuance of Common Stock   $ 87,279 $ 170    
At The Market Equity Program          
Class of Stock [Line Items]          
Aggregate offering price of common share       $ 500,000 $ 500,000
Stock Issued During Period, Shares, New Issues   847,471      
Proceeds from Issuance of Common Stock   $ 87,100      
Weighted Average Price Per Common Share   $ 104.19      
Remaining capacity to issue $ 260,000 $ 260,000      
At The Market Equity Program | Commissions          
Class of Stock [Line Items]          
Payments of Stock Issuance Costs   900      
At The Market Equity Program | Other Offering Costs          
Class of Stock [Line Items]          
Payments of Stock Issuance Costs   $ 400      
Forward Sales Contracts          
Class of Stock [Line Items]          
Forward Contract Indexed to Issuer's Equity, Shares 822,678 2,348,729      
Weighted Average Price Per Common Share $ 121.18 $ 117.36