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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Fixed Maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 10,578,982 | $ 2,437,278
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 513,764 | 73,639
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 822,840 | 1,068,336
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 105,483 | 59,659
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 11,401,822 | 3,505,614
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 619,247 | 133,298
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 9,930,955 | 1,967,870
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 434,506 | 40,328
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 658,939 | 1,016,797
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 60,939 | 48,854
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 10,589,894 | 2,984,667
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 495,445 | 89,182
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 6,388,148 | 1,225,767
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 323,961 | 27,784
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 294,755 | 614,294
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 40,861 | 30,040
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 6,682,903 | 1,840,061
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 364,822 | 57,824
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Canadian Provincial Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 122,746 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 2,532 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 1,235
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 0 | 7
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 122,746 | 1,235
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 2,532 | 7
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Residential Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 452,297 | 78,864
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 7,036 | 846
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 82,314 | 135,414
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 4,057 | 5,247
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 534,611 | 214,278
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 11,093 | 6,093
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 581,701 | 332,785
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 9,825 | 4,021
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 199,298 | 109,411
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 7,100 | 4,289
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 780,999 | 442,196
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 16,925 | 8,310
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Commercial Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 514,877 | 78,632
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 9,806 | 564
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 31,177 | 28,375
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 997 | 2,461
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 546,054 | 107,007
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 10,803 | 3,025
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | US Government Agencies Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,010,387 | 81,317
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 57,718 | 89
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 32,959
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 0 | 426
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,010,387 | 114,276
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 57,718 | 515
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 157,837 | 13,780
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 5,349 | 17
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 13,016 | 18,998
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 3,718 | 3,438
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 170,853 | 32,778
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 9,067 | 3,455
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Foreign Government Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 702,962 | 156,725
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 18,279 | 7,007
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 38,379 | 76,111
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 4,206 | 2,946
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 741,341 | 232,836
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 22,485 | 9,953
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 648,027 | 469,408
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 79,258 | 33,311
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 163,901 | 51,539
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 44,544 | 10,805
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 811,928 | 520,947
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 123,802 | 44,116
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 554,688 | 415,886
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 71,171 | 29,316
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 114,427 | 32,567
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 31,076 | 3,404
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 669,115 | 448,453
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 102,247 | 32,720
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Residential Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 22,646 | 22,836
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 282 | 293
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 7,679 | 6,284
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 298 | 225
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 30,325 | 29,120
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 580 | 518
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 6,772 | 12,448
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 201 | 274
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 9,335 | 7,108
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 1,250 | 1,791
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 16,107 | 19,556
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 1,451 | 2,065
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Commercial Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 3,253 | 3,288
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 248 | 249
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 767 | 5,580
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 117 | 5,385
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 4,020 | 8,868
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 365 | 5,634
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 964
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses |  | 43
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 964
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses |  | 43
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Foreign Government Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 60,668 | 13,986
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 7,356 | 3,136
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 31,693 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 11,803 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 92,361 | 13,986
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 19,159 | 3,136
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 50,658 | 11,619
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 4,417 | 235
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 12,191 | 22,645
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 3,787 | 1,386
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 62,849 | 34,264
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 8,204 | 1,621
Equity Securities [Member] | Nonredeemable Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 12,331 | 11,619
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 2,175 | 235
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 12,191 | 19,100
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 3,787 | 1,292
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 24,522 | 30,719
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 5,962 | 1,527
Equity Securities [Member] | Equity Securities Other Than Non-redeemable Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 38,327 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 2,242 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 3,545
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 0 | 94
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 38,327 | 3,545
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 2,242 | $ 94

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