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Investments - Commercial Mortgage Loan Participations, Allowance for Credit Loss (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]        
Commercial mortgage loan participations $ 546,981 $ 326,347    
Shareholders' equity 8,771,092 7,294,307 $ 5,415,177 $ 6,231,421
Retained Earnings        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Shareholders' equity 5,874,109 5,551,329 5,213,468 4,806,208
Cumulative Effect, Period Of Adoption, Adjustment        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Shareholders' equity   (454) [1] (392) 4,896
Cumulative Effect, Period Of Adoption, Adjustment | Retained Earnings        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Shareholders' equity   (454) [1] $ (392) $ 4,896
Cumulative Effect, Period Of Adoption, Adjustment | Accounting Standards Update 2016-13, Adjustment for Commercial Loan Participations | Retained Earnings        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Shareholders' equity   (265)    
Commercial mortgage participations        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Commercial mortgage loan participations $ 160,602 137,692    
Number of loans | loan 24      
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses beginning balance $ 0 0    
Provision (reversal) for credit losses 3,170 0    
Allowance for credit losses ending balance 3,505 0    
Commercial mortgage participations | Cumulative Effect, Period Of Adoption, Adjustment        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Commercial mortgage loan participations   (335)    
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses beginning balance $ 335 0    
Allowance for credit losses ending balance   $ 335    
[1] Adoption of Accounting Standard Update (ASU) 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, on January 1, 2020. See further discussion in Note 1—Significant Accounting Policies.