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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, 2016 | Dec. 31, 2015
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 | $ 8,327,843 | $ 10,578,982
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 253,005 | 513,764
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1,210,148 | 822,840
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 108,194 | 105,483
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 9,537,991 | 11,401,822
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 361,199 | 619,247
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 | 7,953,012 | 9,930,955
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 242,398 | 434,506
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 994,240 | 658,939
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 62,785 | 60,939
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 8,947,252 | 10,589,894
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 305,183 | 495,445
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 | 4,661,706 | 6,388,148
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 124,444 | 323,961
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 549,273 | 294,755
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 43,282 | 40,861
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 5,210,979 | 6,682,903
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 167,726 | 364,822
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 | 101,578 | 122,746
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 3,541 | 2,532
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 101,578 | 122,746
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 3,541 | 2,532
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 | 490,473 | 452,297
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 9,733 | 7,036
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 112,216 | 82,314
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 3,635 | 4,057
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 602,689 | 534,611
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 13,368 | 11,093
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 | 563,259 | 581,701
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 12,010 | 9,825
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 257,166 | 199,298
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 9,653 | 7,100
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 820,425 | 780,999
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 21,663 | 16,925
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 | 368,465 | 514,877
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 6,858 | 9,806
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 10,853 | 31,177
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 166 | 997
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 379,318 | 546,054
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 7,024 | 10,803
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 | 1,056,101 | 1,010,387
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 63,044 | 57,718
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,056,101 | 1,010,387
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 63,044 | 57,718
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 | 187,194 | 157,837
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 9,396 | 5,349
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 13,635 | 13,016
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 3,068 | 3,718
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 200,829 | 170,853
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 12,464 | 9,067
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 | 524,236 | 702,962
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 13,372 | 18,279
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 51,097 | 38,379
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 2,981 | 4,206
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 575,333 | 741,341
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 16,353 | 22,485
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 | 374,831 | 648,027
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 10,607 | 79,258
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 215,908 | 163,901
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 45,409 | 44,544
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 590,739 | 811,928
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 56,016 | 123,802
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 | 330,757 | 554,688
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 7,914 | 71,171
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 163,152 | 114,427
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 41,605 | 31,076
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 493,909 | 669,115
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 49,519 | 102,247
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 | 0 | 22,646
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 0 | 282
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 412 | 7,679
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 12 | 298
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 412 | 30,325
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 12 | 580
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 | 5,904 | 6,772
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 700 | 201
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 12,581 | 9,335
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 1,465 | 1,250
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 18,485 | 16,107
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 2,165 | 1,451
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 | 5,815 | 3,253
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 735 | 248
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 767
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 0 | 117
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 5,815 | 4,020
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 735 | 365
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 | 32,355 | 60,668
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 1,258 | 7,356
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 39,763 | 31,693
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 2,327 | 11,803
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 72,118 | 92,361
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 3,585 | 19,159
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 | 212,899 | 50,658
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 7,851 | 4,417
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 28,630 | 12,191
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 5,807 | 3,787
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 241,529 | 62,849
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 13,658 | 8,204
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 | 10,831 | 12,331
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 831 | 2,175
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 21,879 | 12,191
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 5,506 | 3,787
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 32,710 | 24,522
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 6,337 | 5,962
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 | 202,068 | 38,327
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 7,020 | 2,242
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 6,751 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 301 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 208,819 | 38,327
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 7,321 | $ 2,242

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