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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, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Assets |  |  |  |  |
Mortgage loans on real estate (net of valuation allowances) |  | $ 5,647,265 | $ 4,966,298 |  |
Policy loans |  | 1,289,868 | 1,344,980 |  |
Funds withheld at interest |  | 5,614,363 | 5,761,471 |  |
Cash and cash equivalents |  | 2,635,596 | 1,889,733 | $ 1,730,489 | $ 1,303,524
Short-term investments |  | 107,503 | 142,598 |  |
Other invested assets |  | 2,215,275 | 1,915,297 |  |
Accrued investment income |  | 520,301 | 427,893 |  |
Liabilities |  |  |  |  |
Interest-sensitive contract liabilities |  | 22,345,126 | 18,004,526 |  |
Long-term debt |  | 3,381,406 | 2,787,873 |  |
Collateral finance and securitization notes |  | 610,246 | 681,961 |  |
Reported Value Measurement [Member] |  |  |  |  |
Assets |  |  |  |  |
Mortgage loans on real estate (net of valuation allowances) | [1] | 5,647,265 | 4,966,298 |  |
Policy loans | [1] | 1,289,868 | 1,344,980 |  |
Funds withheld at interest | [1] | 5,476,148 | 5,655,055 |  |
Cash and cash equivalents | [1] | 1,708,421 | 1,404,566 |  |
Short-term investments | [1] | 18,373 | 36,607 |  |
Other invested assets | [1] | 1,147,167 | 945,731 |  |
Accrued investment income | [1] | 520,301 | 427,893 |  |
Liabilities |  |  |  |  |
Interest-sensitive contract liabilities | [1] | 18,747,630 | 14,547,436 |  |
Long-term debt | [1] | 3,381,406 |  |  |
Debt, Long-term and Short-term, Combined Amount | [1] |  | 2,787,873 |  |
Collateral finance and securitization notes | [1] | 610,246 | 681,961 |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |
Assets |  |  |  |  |
Mortgage loans on real estate (net of valuation allowances) |  | 5,936,051 | 4,917,416 |  |
Policy loans |  | 1,289,868 | 1,344,980 |  |
Funds withheld at interest |  | 5,873,575 | 5,802,518 |  |
Cash and cash equivalents |  | 1,708,421 | 1,404,566 |  |
Short-term investments |  | 18,373 | 36,607 |  |
Other invested assets |  | 1,205,284 | 941,449 |  |
Accrued investment income |  | 520,301 | 427,893 |  |
Liabilities |  |  |  |  |
Interest-sensitive contract liabilities |  | 20,446,240 | 14,611,011 |  |
Long-term Debt, Fair Value |  | 3,564,595 |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  | 2,752,047 |  |
Collateral finance and securitization notes |  | 561,011 | 626,731 |  |
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 |  | 1,708,421 | 1,404,566 |  |
Short-term investments |  | 18,373 | 36,607 |  |
Other invested assets |  | 5,208 | 4,640 |  |
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 |  | 1,289,868 | 1,344,980 |  |
Funds withheld at interest |  | 0 | 0 |  |
Cash and cash equivalents |  | 0 | 0 |  |
Short-term investments |  | 0 | 0 |  |
Other invested assets |  | 82,360 | 83,203 |  |
Accrued investment income |  | 520,301 | 427,893 |  |
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) |  | 5,936,051 | 4,917,416 |  |
Policy loans |  | 0 | 0 |  |
Funds withheld at interest |  | 5,873,575 | 5,802,518 |  |
Cash and cash equivalents |  | 0 | 0 |  |
Short-term investments |  | 0 | 0 |  |
Other invested assets |  | 737,064 | 477,214 |  |
Accrued investment income |  | 0 | 0 |  |
Liabilities |  |  |  |  |
Interest-sensitive contract liabilities |  | 20,446,240 | 14,611,011 |  |
Long-term Debt, Fair Value |  | 3,564,595 |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  | 2,752,047 |  |
Collateral finance and securitization notes |  | 561,011 | 626,731 |  |
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 |  | 380,652 | 376,392 |  |
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] | 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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