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Policy Claims and Benefits (Claims Development) (Details) - Life Insurance Product Line [Member] - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net |  | $ 1,597,776 |  |  |  |  |  |
Asia Pacific [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 1,240,936 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 1,869,953 |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | [1] | 112,373 |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | [1] | 741,390 |  |  |  |  |  |
Americas [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 2,365,538 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 3,043,900 |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | [1] | 178,024 |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | [1] | 856,386 |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 274,830 | $ 259,917 | $ 243,549 | $ 222,987 | $ 185,322 | $ 135,322 | $ 49,321
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 309,287 | 303,340 | 294,265 | 286,632 | 283,316 | 279,008 | 207,882
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 10,352 |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Americas [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 268,073 | 263,565 | 258,297 | 252,018 | 243,890 | 222,139 | 109,323
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 296,717 | 297,688 | 299,098 | 298,262 | 297,037 | 309,119 | $ 322,579
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 0 |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 282,961 | 261,299 | 235,923 | 209,347 | 144,247 | 49,805 |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 328,017 | 314,283 | 301,168 | 303,779 | 313,126 | 292,769 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 16,728 |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Americas [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 297,126 | 292,067 | 285,817 | 277,130 | 248,828 | 114,457 |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 336,323 | 336,436 | 336,552 | 338,977 | 332,907 | $ 349,262 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 24 |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 228,873 | 206,176 | 177,439 | 135,668 | 34,519 |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 284,237 | 272,247 | 265,431 | 300,336 | 277,049 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 21,339 |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Americas [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 356,026 | 349,078 | 337,081 | 304,578 | 128,813 |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 396,010 | 397,151 | 396,383 | 411,373 | $ 407,953 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 272 |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 202,273 | 167,350 | 118,579 | 48,962 |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 267,292 | 251,650 | 257,146 | 278,491 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 32,392 |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Americas [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 422,102 | 407,282 | 360,658 | 146,196 |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 461,947 | 465,167 | 460,917 | $ 459,524 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 1,505 |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 133,091 | 97,769 | 38,310 |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 212,722 | 211,425 | 227,653 |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 40,376 |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Americas [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 436,892 | 392,517 | 184,940 |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 500,725 | 499,785 | $ 500,843 |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 4,885 |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 87,037 | 35,442 |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 214,707 | 216,499 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 63,383 |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Americas [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 402,759 | 189,853 |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 513,722 | $ 485,442 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 27,190 |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 31,871 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 253,691 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 156,761 |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Americas [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 182,560 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 538,456 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | $ 234,548 |  |  |  |  |  |
[1] | 2012-2017 Unaudited.

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