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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 24,006,407 | $ 21,966,803
Available-for-sale Securities | 23,982,119 | 23,210,968
Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 38,882,168 | 35,281,412
Available-for-sale Securities, Gross Unrealized Gains | 1,858,668 | 2,982,754
Available-for-sale Securities, Gross Unrealized Losses | 748,490 | 113,346
Available-for-sale Securities | $ 39,992,346 | $ 38,150,820
Percentage Of Total Available For Sale Securities | 100.00% | 100.00%
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | $ 275 | $ 275
Equity Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis |  | 102,841
Available-for-sale Securities, Gross Unrealized Gains |  | 958
Available-for-sale Securities, Gross Unrealized Losses |  | 3,647
Available-for-sale Securities |  | $ 100,152
Percentage Of Total Available For Sale Securities |  | 100.00%
Corporate Debt Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 24,006,407 | $ 21,966,803
Available-for-sale Securities, Gross Unrealized Gains | 530,804 | 1,299,594
Available-for-sale Securities, Gross Unrealized Losses | 555,092 | 55,429
Available-for-sale Securities | $ 23,982,119 | $ 23,210,968
Percentage Of Total Available For Sale Securities | 59.90% | 60.90%
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | $ 0 | $ 0
Canadian Provincial Governments [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 2,768,466 | 2,843,273
Available-for-sale Securities, Gross Unrealized Gains | 1,126,227 | 1,378,510
Available-for-sale Securities, Gross Unrealized Losses | 2,308 | 1,707
Available-for-sale Securities | $ 3,892,385 | $ 4,220,076
Percentage Of Total Available For Sale Securities | 9.70% | 11.10%
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | $ 0 | $ 0
Residential Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 1,872,236 | 1,695,126
Available-for-sale Securities, Gross Unrealized Gains | 22,267 | 36,632
Available-for-sale Securities, Gross Unrealized Losses | 25,282 | 11,878
Available-for-sale Securities | $ 1,869,221 | $ 1,719,880
Percentage Of Total Available For Sale Securities | 4.70% | 4.50%
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | $ 0 | $ 0
Asset-backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 2,171,254 | 1,634,758
Available-for-sale Securities, Gross Unrealized Gains | 10,779 | 18,798
Available-for-sale Securities, Gross Unrealized Losses | 32,829 | 5,194
Available-for-sale Securities | $ 2,149,204 | $ 1,648,362
Percentage Of Total Available For Sale Securities | 5.40% | 4.30%
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | $ 275 | $ 275
Commercial Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 1,428,115 | 1,285,594
Available-for-sale Securities, Gross Unrealized Gains | 9,153 | 22,627
Available-for-sale Securities, Gross Unrealized Losses | 18,234 | 4,834
Available-for-sale Securities | $ 1,419,034 | $ 1,303,387
Percentage Of Total Available For Sale Securities | 3.50% | 3.40%
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | $ 0 | $ 0
US Treasury and Government [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 2,233,537 | 1,953,436
Available-for-sale Securities, Gross Unrealized Gains | 10,204 | 12,089
Available-for-sale Securities, Gross Unrealized Losses | 57,867 | 21,933
Available-for-sale Securities | $ 2,185,874 | $ 1,943,592
Percentage Of Total Available For Sale Securities | 5.50% | 5.10%
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | $ 0 | $ 0
US States and Political Subdivisions Debt Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 721,290 | 647,727
Available-for-sale Securities, Gross Unrealized Gains | 39,914 | 59,997
Available-for-sale Securities, Gross Unrealized Losses | 9,010 | 4,296
Available-for-sale Securities | $ 752,194 | $ 703,428
Percentage Of Total Available For Sale Securities | 1.90% | 1.80%
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | $ 0 | $ 0
Debt Security, Government, Non-US [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 3,680,863 | 3,254,695
Available-for-sale Securities, Gross Unrealized Gains | 109,320 | 154,507
Available-for-sale Securities, Gross Unrealized Losses | 47,868 | 8,075
Available-for-sale Securities | $ 3,742,315 | $ 3,401,127
Percentage Of Total Available For Sale Securities | 9.40% | 8.90%
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | $ 0 | $ 0
Nonredeemable Preferred Stock [Member] | Equity Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis |  | 41,553
Available-for-sale Securities, Gross Unrealized Gains |  | 479
Available-for-sale Securities, Gross Unrealized Losses |  | 2,226
Available-for-sale Securities |  | $ 39,806
Percentage Of Total Available For Sale Securities |  | 39.70%
Equity Securities Other Than Non-redeemable Preferred Stock [Member] | Equity Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis |  | $ 61,288
Available-for-sale Securities, Gross Unrealized Gains |  | 479
Available-for-sale Securities, Gross Unrealized Losses |  | 1,421
Available-for-sale Securities |  | $ 60,346
Percentage Of Total Available For Sale Securities |  | 60.30%

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