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Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Jan. 01, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Estimated impact to total equity at January 1, 2021 $ 3,210,628 $ 3,883,386 $ 6,323,127 $ 6,375,208 $ 6,295,735   $ 6,348,988
Estimated impact to retained earnings at January 1, 2021 $ 3,974,069   $ 2,767,422        
Pro Forma | Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Minimum              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Estimated impact to total equity at January 1, 2021           $ 1,500,000  
Pro Forma | Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Maximum              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Estimated impact to total equity at January 1, 2021           2,000,000  
Estimated impact to retained earnings at January 1, 2021           $ 100,000