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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Assets |  |  |  |  |  |
Mortgage loans on real estate (net of valuation allowances) |  | $ 4,779,074 |  | $ 4,400,533 |  |
Policy loans |  | 1,320,050 |  | 1,357,624 |  |
Funds withheld at interest |  | 5,976,301 |  | 6,083,388 |  |
Cash and cash equivalents |  | 1,730,489 |  | 1,303,524 | $ 1,204,590 | $ 1,200,718
Short-term investments |  | 229,928 |  | 93,304 |  |
Other invested assets |  | 1,706,979 |  | 1,505,332 |  |
Accrued investment income |  | 455,296 |  | 392,721 |  |
Liabilities |  |  |  |  |  |
Interest-sensitive contract liabilities |  | 16,751,379 |  | 16,227,642 |  |
Long-term debt |  | 2,787,975 |  | 2,788,365 |  |
Collateral finance and securitization notes |  | 710,792 |  | 783,938 |  |
Reported Value Measurement [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Mortgage loans on real estate (net of valuation allowances) | [1] | 4,779,074 |  | 4,400,533 |  |
Policy loans | [1] | 1,320,050 |  | 1,357,624 |  |
Funds withheld at interest | [1] | 5,833,925 |  | 5,955,092 |  |
Cash and cash equivalents | [1] | 1,073,209 |  | 946,736 |  |
Short-term investments | [1] | 43,877 |  | 42,558 |  |
Other invested assets | [1] | 842,626 |  | 651,792 |  |
Accrued investment income | [1] | 455,296 |  | 392,721 |  |
Liabilities |  |  |  |  |  |
Interest-sensitive contract liabilities | [1] | 13,319,348 |  | 12,683,872 |  |
Long-term debt | [1] | 2,787,975 |  |  |  |
Debt, Long-term and Short-term, Combined Amount | [1] |  |  | 2,788,365 |  |
Collateral finance and securitization notes | [1] | 710,792 |  | 783,938 |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Mortgage loans on real estate (net of valuation allowances) |  | 4,652,481 |  | 4,477,654 |  |
Policy loans |  | 1,320,050 |  | 1,357,624 |  |
Funds withheld at interest |  | 6,040,671 |  | 6,275,623 |  |
Cash and cash equivalents |  | 1,073,209 |  | 946,736 |  |
Short-term investments |  | 43,877 |  | 42,558 |  |
Other invested assets |  | 839,280 |  | 679,377 |  |
Accrued investment income |  | 455,296 |  | 392,721 |  |
Liabilities |  |  |  |  |  |
Interest-sensitive contract liabilities |  | 13,113,427 | [1] | 12,917,243 |  |
Long-term Debt, Fair Value |  | 2,850,344 |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  |  | 2,959,912 |  |
Collateral finance and securitization notes |  | 652,380 |  | 722,145 |  |
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 1 Member |  |  |  |  |  |
Assets |  |  |  |  |  |
Mortgage loans on real estate (net of valuation allowances) |  | 0 |  | 0 |  |
Policy loans |  | 0 |  | 0 |  |
Funds withheld at interest |  | 0 |  | 0 |  |
Cash and cash equivalents |  | 1,073,209 |  | 946,736 |  |
Short-term investments |  | 43,877 |  | 42,558 |  |
Other invested assets |  | 5,618 |  | 28,540 |  |
Accrued investment income |  | 0 |  | 0 |  |
Liabilities |  |  |  |  |  |
Interest-sensitive contract liabilities |  | 0 |  | 0 |  |
Long-term Debt, Fair Value |  | 0 |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  |  | 0 |  |
Collateral finance and securitization notes |  | 0 |  | 0 |  |
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 2 Member |  |  |  |  |  |
Assets |  |  |  |  |  |
Mortgage loans on real estate (net of valuation allowances) |  | 0 |  | 0 |  |
Policy loans |  | 1,320,050 |  | 1,357,624 |  |
Funds withheld at interest |  | 0 |  | 0 |  |
Cash and cash equivalents |  | 0 |  | 0 |  |
Short-term investments |  | 0 |  | 0 |  |
Other invested assets |  | 71,401 |  | 67,778 |  |
Accrued investment income |  | 455,296 |  | 392,721 |  |
Liabilities |  |  |  |  |  |
Interest-sensitive contract liabilities |  | 0 |  | 0 |  |
Long-term Debt, Fair Value |  | 0 |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  |  | 0 |  |
Collateral finance and securitization notes |  | 0 |  | 0 |  |
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 3 Member |  |  |  |  |  |
Assets |  |  |  |  |  |
Mortgage loans on real estate (net of valuation allowances) |  | 4,652,481 |  | 4,477,654 |  |
Policy loans |  | 0 |  | 0 |  |
Funds withheld at interest |  | 6,040,671 |  | 6,275,623 |  |
Cash and cash equivalents |  | 0 |  | 0 |  |
Short-term investments |  | 0 |  | 0 |  |
Other invested assets |  | 382,284 |  | 247,934 |  |
Accrued investment income |  | 0 |  | 0 |  |
Liabilities |  |  |  |  |  |
Interest-sensitive contract liabilities |  | 13,113,427 |  | 12,917,243 |  |
Long-term Debt, Fair Value |  | 2,850,344 |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  |  | 2,959,912 |  |
Collateral finance and securitization notes |  | 652,380 |  | 722,145 |  |
Estimate of Fair Value Measurement [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Mortgage loans on real estate (net of valuation allowances) |  | 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 |  | 379,977 |  | 335,125 |  |
Accrued investment income |  | 0 |  | 0 |  |
Liabilities |  |  |  |  |  |
Interest-sensitive contract liabilities |  | 0 |  | 0 |  |
Long-term Debt, Fair Value |  | 0 |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  |  | 0 |  |
Collateral finance and securitization notes |  | $ 0 |  | $ 0 |  |
[1] | aid.September 30, 2018: Carrying Value (1) Estimated Fair Value Fair Value Measurement Using:Level 1 Level 2 Level 3 NAVAssets: Mortgage loans on real estate $4,779,074 $4,652,481 $— $— $4,652,481 $—Policy loans 1,320,050 1,320,050 — 1,320,050 — —Funds withheld at interest 5,833,925 6,040,671 — — 6,040,671 —Cash and cash equivalents 1,073,209 1,073,209 1,073,209 — — —Short-term investments 43,877 43,877 43,877 — — —Other invested assets 842,626 839,280 5,618 71,401 382,284 379,977Accrued investment income 455,296 455,296 — 455,296 — —Liabilities: Interest-sensitive contract liabilities $13,319,348 $13,113,427 $— $— $13,113,427 $—Long-term debt 2,787,975 2,850,344 — — 2,850,344 —Collateral finance and securitization notes 710,792 652,380 — — 652,380 — December 31, 2017: Carrying Value (1) Estimated Fair Value Fair Value Measurement Using:Level 1 Level 2 Level 3 NAVAssets: Mortgage loans on real estate $4,400,533 $4,477,654 $— $— $4,477,654 $—Policy loans 1,357,624 1,357,624 — 1,357,624 — —Funds withheld at interest 5,955,092 6,275,623 — — 6,275,623 —Cash and cash equivalents 946,736 946,736 946,736 — — —Short-term investments 42,558 42,558 42,558 — — —Other invested assets 651,792 679,377 28,540 67,778 247,934 335,125Accrued investment income 392,721 392,721 — 392,721 — —Liabilities: Interest-sensitive contract liabilities $12,683,872 $12,917,243 $— $— $12,917,243 $—Long-term debt 2,788,365 2,959,912 — — 2,959,912 —Collateral finance and securitization notes 783,938 722,145 — — 722,145 — (1)Carrying values presented herein may differ from those in the Company’s condensed 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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