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Investments (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended
Sep. 30, 2013
securities
Sep. 30, 2012
Sep. 30, 2013
securities
Sep. 30, 2012
Dec. 31, 2012
securities
Sep. 30, 2013
Collateral Fixed Maturity Securities
Dec. 31, 2012
Collateral Fixed Maturity Securities
Sep. 30, 2013
Canadian Province Of Ontario Securities
Dec. 31, 2012
Canadian Province Of Ontario Securities
Sep. 30, 2013
Canadian Province Of Quebec Securities
Dec. 31, 2012
Canadian Province Of Quebec Securities
Sep. 30, 2013
Available For Sale Securities Amortized Cost [Member]
Dec. 31, 2012
Available For Sale Securities Amortized Cost [Member]
Sep. 30, 2013
Available For Sale Securities Fair Value Disclosure [Member]
Dec. 31, 2012
Available For Sale Securities Fair Value Disclosure [Member]
Sep. 30, 2013
Investment in mortgage loans
Dec. 31, 2012
Investment in mortgage loans
Sep. 30, 2013
Asset-backed and mortgage-backed securities
Non-investment grade securities
Dec. 31, 2012
Asset-backed and mortgage-backed securities
Non-investment grade securities
Sep. 30, 2013
Fixed maturity securities
Dec. 31, 2012
Fixed maturity securities
Sep. 30, 2013
Fixed maturity securities
Non-investment grade securities
Dec. 31, 2012
Fixed maturity securities
Non-investment grade securities
Sep. 30, 2013
Fixed maturity securities
Corporate securities
Non-investment grade securities
Dec. 31, 2012
Fixed maturity securities
Corporate securities
Non-investment grade securities
Sep. 30, 2012
Reported Value Measurement [Member]
Investment Narrative [Line Items]                                                    
Transfer to Investments                                                   $ 5,406,898,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss                                       311,476,000 132,254,000 36,978,000 71,010,000 20,112,000 8,671,000  
Available-for-sale Securities, Amortized Cost Basis 11,505,673,000   11,505,673,000   11,333,431,000 53,800,000 16,900,000                                      
Securities held in trust                       7,954,600,000 7,549,000,000 8,260,600,000 7,913,800,000                      
Proceeds From Sale Of Available For Sale Securities Sold At Loss 410,400,000 220,500,000 872,200,000 622,100,000   92,200,000 95,600,000                                      
Available-for-sale Securities 11,934,562,000   11,934,562,000   12,380,071,000 54,500,000 17,000,000 1,238,500,000 1,400,000,000 1,479,400,000 1,785,000,000                              
Securities as a percentage of consolidated stockholder equity 10.00%   10.00%   10.00%                                          
Number of fixed maturity and equity securities in an unrealized loss position 1,397   1,397   567                                          
Gross Unrealized Losses - 12 months or greater                                   15,300,000 61,500,000 64,583,000 109,930,000 23,263,000 66,970,000 7,957,000 5,501,000  
Net other-than-temporary impairment losses on fixed maturities recognized in earnings (332,000) (2,555,000) (10,643,000) (19,180,000)                                            
Realized losses on fixed maturity and equity securities sold (30,434,000) (6,668,000) (48,406,000) (23,090,000)                                            
Minimum percentage of fair value     100.00%                                              
Securities Borrowed                       87,500,000 87,500,000 87,500,000 87,500,000                      
Collateral Obtained Percent Of Fair Value Reverse Repurchase Agreements     100.00%                                              
Securities pledged or received 292,400,000   292,400,000   290,200,000                                          
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 307,000,000   307,000,000   305,900,000                                          
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 347,500,000   347,500,000   342,000,000                                          
Mortgage loans percentage of total investments 7.80%   7.80%   7.00%                                          
Maximum loan to value ratio on mortgage loan approval     75.00%                                              
Mortgage loans on nonaccrual status                               $ 3,046,000 $ 16,886,000                  
Policy loans, percentage of total investments 3.90%   3.90%   3.90%                                          
Funds withheld at interest, percentage of total investments 18.00%   18.00%   17.00%                                          
Funds withheld at interest, percentage attibutable to one client 70.00%   70.00%   69.70%                                          
Other invested assets, percentage of total investments 3.50%   3.50%   3.50%