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Fair Values of Financial Instruments (Fair Values and Carrying Amounts of Financial Instruments) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Fixed maturity securities, available for sale, fair value | $ 50,171,303 | $ 45,923,727
Derivative instruments | 888,208 | 205,149
Other investments | 642,219 | 355,531
Coinsurance deposits | 5,029,374 | 4,954,068
Liabilities |  |
Policy benefit reserves | 60,203,010 | 57,606,009
Carrying Amount |  |
Assets |  |
Fixed maturity securities, available for sale, fair value | 50,171,303 | 45,923,727
Mortgage loans on real estate | 3,083,675 | 2,943,091
Derivative instruments | 888,208 | 205,149
Other investments | 642,219 | 355,531
Cash and cash equivalents | 1,215,967 | 344,396
Coinsurance deposits | 5,029,374 | 4,954,068
Counterparty collateral | 0 | 33,101
Liabilities |  |
Policy benefit reserves | 59,849,400 | 57,249,510
Single premium immediate annuity (SPIA) benefit reserves | 263,430 | 270,406
Notes payable | 494,850 | 494,591
Subordinated debentures | 243,200 | 242,982
Amounts due under repurchase agreements | 0 | 109,298
Carrying Amount | Interest Rate Caps |  |
Assets |  |
Interest rate derivative assets | 59 | 597
Carrying Amount | Interest Rate Swap |  |
Assets |  |
Interest rate derivative assets | 0 | 354
Liabilities |  |
Interest rate derivative liabilities | 881 | 0
Fair Value |  |
Assets |  |
Fixed maturity securities, available for sale, fair value | 50,171,303 | 45,923,727
Mortgage loans on real estate | 3,128,732 | 2,920,612
Derivative instruments | 888,208 | 205,149
Other investments | 642,219 | 348,970
Cash and cash equivalents | 1,215,967 | 344,396
Coinsurance deposits | 4,574,116 | 4,553,790
Counterparty collateral | 0 | 33,101
Liabilities |  |
Policy benefit reserves | 50,673,721 | 49,180,143
Single premium immediate annuity (SPIA) benefit reserves | 271,842 | 279,077
Notes payable | 510,640 | 489,985
Subordinated debentures | 246,046 | 215,514
Amounts due under repurchase agreements | 0 | 109,298
Fair Value | Interest Rate Caps |  |
Assets |  |
Interest rate derivative assets | 59 | 597
Fair Value | Interest Rate Swap |  |
Assets |  |
Interest rate derivative assets | 0 | 354
Liabilities |  |
Interest rate derivative liabilities | $ 881 | $ 0

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