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Reinsurance (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 21 Months Ended 36 Months Ended 48 Months Ended
Jan. 01, 2018
Jul. 01, 2017
Jun. 30, 2017
Jan. 01, 2017
Dec. 31, 2013
Jul. 01, 2011
Dec. 31, 2010
Dec. 31, 2009
Jan. 31, 2001
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2013
Dec. 31, 2017
Dec. 31, 2013
Effects of Reinsurance [Line Items]                                
Realized investment gains (losses)                   $ (49,042) $ (32,579)          
Reinsurance recoverables                   31,696,534         $ 32,555,500  
PAR U                                
Effects of Reinsurance [Line Items]                                
Reinsurance recoverables                   11,096,056         11,111,272  
PURC                                
Effects of Reinsurance [Line Items]                                
Reinsurance recoverables                   3,700,711         3,577,962  
PARCC                                
Effects of Reinsurance [Line Items]                                
Reinsurance recoverables                   2,535,700         2,546,673  
GUL Re                                
Effects of Reinsurance [Line Items]                                
Reinsurance recoverables                   1,845,549         1,772,950  
PAR Term                                
Effects of Reinsurance [Line Items]                                
Reinsurance recoverables                   1,583,047         1,559,618  
Prudential of Taiwan                                
Effects of Reinsurance [Line Items]                                
Reinsurance recoverables                   1,451,312         1,406,686  
Term Re                                
Effects of Reinsurance [Line Items]                                
Reinsurance recoverables                   1,053,052         966,509  
Prudential Insurance                                
Effects of Reinsurance [Line Items]                                
Reinsurance recoverables                   1,039,039         1,152,241  
DART                                
Effects of Reinsurance [Line Items]                                
Reinsurance recoverables                   36,658         $ 0  
Union Hamilton Reinsurance, Ltd.                                
Effects of Reinsurance [Line Items]                                
Reinsurance recoverables                   $ 3,200,000            
Union Hamilton Reinsurance, Ltd. | Quote Share Reinsurance                                
Effects of Reinsurance [Line Items]                                
Reinsurance Retention Policy, Amount Retained                       $ 2,900,000        
Reinsurance Retention Policy, Reinsured Risk, Percentage                       50.00%        
Affiliated Entity | PAR U                                
Effects of Reinsurance [Line Items]                                
Reinsurance Retention Policy, Reinsured Risk, Percentage           95.00% 70.00%                  
Affiliated Entity | PURC                                
Effects of Reinsurance [Line Items]                                
Reinsurance Retention Policy, Reinsured Risk, Percentage                         95.00% 70.00%    
Affiliated Entity | PARCC                                
Effects of Reinsurance [Line Items]                                
Reinsurance Retention Policy, Reinsured Risk, Percentage               90.00%                
Affiliated Entity | GUL Re                                
Effects of Reinsurance [Line Items]                                
Reinsurance Retention Policy, Reinsured Risk, Percentage       95.00% 30.00%                      
Affiliated Entity | PAR Term                                
Effects of Reinsurance [Line Items]                                
Reinsurance Retention Policy, Reinsured Risk, Percentage                               95.00%
Affiliated Entity | Prudential of Taiwan                                
Effects of Reinsurance [Line Items]                                
Related Party Transaction, Term                 2 years              
Affiliated Entity | Term Re                                
Effects of Reinsurance [Line Items]                                
Reinsurance Retention Policy, Reinsured Risk, Percentage                             95.00%  
Affiliated Entity | Prudential Insurance                                
Effects of Reinsurance [Line Items]                                
Reinsurance Retention Policy, Reinsured Risk, Percentage                   100.00%            
Affiliated Entity | DART                                
Effects of Reinsurance [Line Items]                                
Reinsurance Retention Policy, Reinsured Risk, Percentage 95.00%                              
Affiliated Entity | UPARC                                
Effects of Reinsurance [Line Items]                                
Reinsurance Retention Policy, Excess Retention, Percentage     30.00%                          
Reinsurance Retention Policy, Amount Retained     $ 1,000                          
Reinsurance Retention Policy, Reinsured Risk, Percentage     27.00%                          
Reinsurance Retention Policy, Uncollected Charges And Fees Risk, Percentage     30.00%                          
Affiliated Entity | UPARC | Impacts of Recapture                                
Effects of Reinsurance [Line Items]                                
Invested assets received   $ 557,000                            
Reinsurance recoverable   (760,000)                            
Realized investment gains (losses)   $ (203,000)