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Significant Accounting Policies and Pronouncements (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
[1]
Jan. 01, 2018
Dec. 31, 2016
Accounting Policies [Abstract]                              
Commercial mortgage and other loans, Loan-to-value ratios (greater than)                   100.00%          
Commercial mortgage and other loans, Loan-to-value ratios (less than)                   100.00%          
Commercial mortgage and other loans, Debt service coverage ratios (less than)                   1.0          
Commercial mortgage and other loans, Debt service coverage ratios (greater than)                   1.0          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                              
Retained earnings $ 1,577,453       $ 1,612,435         $ 1,577,453 $ 1,612,435        
Accumulated other comprehensive income (loss) 281,442       (28,296)         281,442 (28,296)        
Pre-tax charge to income 34,411 $ 38,637 $ 14,122 $ 71,614 8,667 $ 16,570 $ 23,307 $ 9,243   $ 158,784 57,787 $ 171,450      
Cumulative effect of adoption         (27)           (27)        
Uncertain tax positions measurement percentage (greater than)                   50.00%          
Securities Loaned Transactions Collateral Fair Value of Domestic Securities                   102.00%          
Securities Loaned Transactions Collateral Fair Value of Foreign Securities                   105.00%          
Minimum                              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                              
Repurchase and Resale Agreements, Collateral, Percentage                   95.00%          
Accumulated Other Comprehensive Income                              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                              
Accumulated other comprehensive income (loss) 281,442       (28,296)         $ 281,442 (28,296) 165,346     $ 70,975
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 281,442       (28,296)         281,442 (28,296) 165,346     70,975
Cumulative effect of adoption                           $ 30,400  
Accumulated Other Comprehensive Income | ASU 2016-01                              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                              
Cumulative effect of adoption         (1,539)           (1,539)     (1,539)  
Retained earnings                              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                              
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 1,577,453       $ 1,612,435         $ 1,577,453 $ 1,612,435 $ 1,526,310     $ 1,448,517
Cumulative effect of adoption                         $ (1,981) (30,400)  
Retained earnings | ASU 2016-01                              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                              
Cumulative effect of adoption                           7,936  
Restatement Adjustment | ASU 2016-01                              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                              
Retained earnings                           7,900  
Accumulated other comprehensive income (loss)                           (1,500)  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest                           $ 6,400  
Individual Life | Accounting for Certain Reinsurance Contracts                              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                              
Pre-tax charge to income                 $ (2,000)            
[1] Includes the impact from the adoption of ASUs 2017-08 and 2017-12. See Note 2.