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Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |  |  |
Mortgage loans on real estate |  | $ 4,966,298 | $ 4,400,533 |  |
Policy loans |  | 1,344,980 | 1,357,624 |  |
Funds withheld at interest |  | 5,761,471 | 6,083,388 |  |
Cash and cash equivalents |  | 1,889,733 | 1,303,524 | $ 1,200,718 | $ 1,525,275
Short-term investments |  | 142,598 | 93,304 |  |
Other invested assets |  | 1,915,297 | 1,505,332 |  |
Accrued investment income |  | 427,893 | 392,721 |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |  |  |
Interest-sensitive contract liabilities |  | 18,004,526 | 16,227,642 |  |
Collateral finance and securitization notes |  | 681,961 | 783,938 |  |
Carrying Value [Member] |  |  |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |  |  |
Mortgage loans on real estate | [1] | 4,966,298 | 4,400,533 |  |
Policy loans | [1] | 1,344,980 | 1,357,624 |  |
Funds withheld at interest | [1] | 5,655,055 | 5,955,092 |  |
Cash and cash equivalents | [1] | 1,404,566 | 946,736 |  |
Short-term investments | [1] | 36,607 | 42,558 |  |
Other invested assets | [1] | 945,731 | 690,198 |  |
Accrued investment income | [1] | 427,893 | 392,721 |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |  |  |
Interest-sensitive contract liabilities | [1] | 14,547,436 | 12,683,872 |  |
Long And Short Term Debt | [1] | 2,787,873 | 2,788,365 |  |
Collateral finance and securitization notes | [1] | 681,961 | 783,938 |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |  |  |
Mortgage loans on real estate |  | 4,917,416 | 4,477,654 |  |
Policy loans |  | 1,344,980 | 1,357,624 |  |
Funds withheld at interest |  | 5,802,518 | 6,275,623 |  |
Cash and cash equivalents |  | 1,404,566 | 946,736 |  |
Short-term investments |  | 36,607 | 42,558 |  |
Other invested assets |  | 941,449 | 718,282 |  |
Accrued investment income |  | 427,893 | 392,721 |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |  |  |
Interest-sensitive contract liabilities |  | 14,611,011 | 12,917,243 |  |
Long And Short Term Debt |  | 2,752,047 | 2,959,912 |  |
Collateral finance and securitization notes |  | 626,731 | 722,145 |  |
Estimate of Fair Value Measurement [Member] | Net Asset Value [Member] |  |  |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |  |  |
Mortgage loans on real estate |  | 0 | 0 |  |
Policy loans |  | 0 | 0 |  |
Funds withheld at interest |  | 0 | 0 |  |
Cash and cash equivalents |  | 0 | 0 |  |
Short-term investments |  | 0 | 0 |  |
Other invested assets |  | 376,392 | 335,125 |  |
Accrued investment income |  | 0 | 0 |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |  |  |
Interest-sensitive contract liabilities |  | 0 | 0 |  |
Long And Short Term Debt |  | 0 | 0 |  |
Collateral finance and securitization notes |  | 0 | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |  |  |
Mortgage loans on real estate |  | 0 | 0 |  |
Policy loans |  | 0 | 0 |  |
Funds withheld at interest |  | 0 | 0 |  |
Cash and cash equivalents |  | 1,404,566 | 946,736 |  |
Short-term investments |  | 36,607 | 42,558 |  |
Other invested assets |  | 4,640 | 28,540 |  |
Accrued investment income |  | 0 | 0 |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |  |  |
Interest-sensitive contract liabilities |  | 0 | 0 |  |
Long And Short Term Debt |  | 0 | 0 |  |
Collateral finance and securitization notes |  | 0 | 0 |  |
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |  |  |
Mortgage loans on real estate |  | 0 | 0 |  |
Policy loans |  | 1,344,980 | 1,357,624 |  |
Funds withheld at interest |  | 0 | 0 |  |
Cash and cash equivalents |  | 0 | 0 |  |
Short-term investments |  | 0 | 0 |  |
Other invested assets |  | 83,203 | 67,778 |  |
Accrued investment income |  | 427,893 | 392,721 |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |  |  |
Interest-sensitive contract liabilities |  | 0 | 0 |  |
Long And Short Term Debt |  | 0 | 0 |  |
Collateral finance and securitization notes |  | 0 | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |  |  |
Mortgage loans on real estate |  | 4,917,416 | 4,477,654 |  |
Policy loans |  | 0 | 0 |  |
Funds withheld at interest |  | 5,802,518 | 6,275,623 |  |
Cash and cash equivalents |  | 0 | 0 |  |
Short-term investments |  | 0 | 0 |  |
Other invested assets |  | 477,214 | 286,839 |  |
Accrued investment income |  | 0 | 0 |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |  |  |
Interest-sensitive contract liabilities |  | 14,611,011 | 12,917,243 |  |
Long And Short Term Debt |  | 2,752,047 | 2,959,912 |  |
Collateral finance and securitization notes |  | $ 626,731 | $ 722,145 |  |
[1] | Carrying values presented herein may differ from those in the Company’s consolidated balance sheets because certain items within the respective financial statement captions may be measured at fair value on a recurring basis.

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