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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 12,073,860 | $ 4,565,273
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 408,581 | 40,239
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 7,226,996 | 2,738,393
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 339,909 | 73,107
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 19,300,856 | 7,303,666
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 748,490 | 113,346
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 11,189,013 | 4,339,799
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 360,213 | 36,789
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 7,093,099 | 2,644,670
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 324,612 | 65,548
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 18,282,112 | 6,984,469
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 684,825 | 102,337
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 8,505,371 | 1,886,212
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 302,604 | 17,099
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 3,611,266 | 1,009,750
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 195,082 | 28,080
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 12,116,637 | 2,895,962
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 497,686 | 45,179
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Canadian Provincial Governments [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 25,169 | 18,688
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 419 | 91
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 131,806 | 111,560
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 1,612 | 1,596
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 156,975 | 130,248
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 2,031 | 1,687
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Residential Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 269,558 | 566,699
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 2,488 | 5,852
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 836,741 | 224,439
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 22,760 | 6,004
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,106,299 | 791,138
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 25,248 | 11,856
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,102,677 | 434,274
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 24,271 | 2,707
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 381,609 | 168,524
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 8,523 | 2,434
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,484,286 | 602,798
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 32,794 | 5,141
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Commercial Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 384,259 | 220,401
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 4,304 | 1,914
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 414,719 | 103,269
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 13,930 | 2,920
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 798,978 | 323,670
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 18,234 | 4,834
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 8,616 | 800,298
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 80 | 6,177
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1,086,694 | 767,197
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 57,787 | 15,756
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,095,310 | 1,567,495
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 57,867 | 21,933
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 103,504 | 43,510
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 1,538 | 242
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 157,330 | 68,666
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 7,472 | 4,054
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 260,834 | 112,176
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 9,010 | 4,296
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Debt Security, Government, Non-US [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 789,859 | 369,717
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 24,509 | 2,707
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 472,934 | 191,265
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 17,446 | 4,704
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,262,793 | 560,982
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 41,955 | 7,411
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 884,847 | 225,474
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 48,368 | 3,450
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 133,897 | 93,723
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 15,297 | 7,559
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,018,744 | 319,197
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 63,665 | 11,009
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 755,679 | 194,879
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 42,760 | 3,317
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 122,559 | 75,731
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 14,646 | 6,933
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 878,238 | 270,610
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 57,406 | 10,250
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Canadian Provincial Governments [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 443 | 1,995
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 34 | 20
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1,770 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 243 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2,213 | 1,995
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 277 | 20
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Residential Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1,026 | 1,369
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 34 | 22
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,026 | 1,369
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 34 | 22
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1,063 | 1,489
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 35 | 53
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,063 | 1,489
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 35 | 53
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Debt Security, Government, Non-US [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 128,725 | 28,600
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 5,574 | 113
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 7,479 | 15,134
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 339 | 551
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 136,204 | 43,734
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 5,913 | 664
Equity Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 5,902
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses |  | 1,024
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 73,722
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses |  | 2,623
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 79,624
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses |  | 3,647
Equity Securities [Member] | Nonredeemable Preferred Stock [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 82
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses |  | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 26,471
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses |  | 2,225
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 26,553
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses |  | 2,226
Equity Securities [Member] | Equity Securities Other Than Non-redeemable Preferred Stock [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 5,820
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses |  | 1,023
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 47,251
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses |  | 398
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 53,071
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses |  | $ 1,421

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