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Fair Values of Financial Instruments (Carrying Amounts and Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Available for sale securities, fair value | $ 45,923,727 | $ 45,372,989
Held for investment | 0 | 76,460
Derivative instruments | 205,149 | 1,568,380
Other investments | 355,531 | 616,764
Coinsurance deposits | 4,954,068 | 4,858,289
Liabilities |  |
Policy benefit reserves | 57,606,009 | 56,142,673
Carrying Amount |  |
Assets |  |
Available for sale securities, fair value | 45,923,727 | 45,372,989
Held for investment | 0 | 77,041
Mortgage loans on real estate | 2,943,091 | 2,665,531
Derivative instruments | 205,149 | 1,568,380
Other investments | 355,531 | 616,764
Cash and cash equivalents | 344,396 | 1,434,045
Coinsurance deposits | 4,954,068 | 4,858,289
Counterparty collateral | 33,101 | 186,108
Liabilities |  |
Policy benefit reserves | 57,249,510 | 55,786,011
Single premium immediate annuity (SPIA) benefit reserves | 270,406 | 282,563
Notes payable | 494,591 | 494,093
Subordinated debentures | 242,982 | 242,565
Amounts due under repurchase agreements | 109,298 | 0
Carrying Amount | Interest Rate Caps |  |
Assets |  |
Interest rate derivative assets | 597 | 415
Carrying Amount | Interest Rate Swap |  |
Assets |  |
Interest rate derivative assets | 354 | 0
Liabilities |  |
Interest rate derivative liabilities | 0 | 789
Fair Value |  |
Assets |  |
Available for sale securities, fair value | 45,923,727 | 45,372,989
Held for investment | 0 | 76,460
Mortgage loans on real estate | 2,920,612 | 2,670,037
Derivative instruments | 205,149 | 1,568,380
Other investments | 348,970 | 605,894
Cash and cash equivalents | 344,396 | 1,434,045
Coinsurance deposits | 4,553,790 | 4,347,990
Counterparty collateral | 33,101 | 186,108
Liabilities |  |
Policy benefit reserves | 49,180,143 | 46,344,931
Single premium immediate annuity (SPIA) benefit reserves | 279,077 | 292,153
Notes payable | 489,985 | 521,800
Subordinated debentures | 215,514 | 244,117
Amounts due under repurchase agreements | 109,298 | 0
Fair Value | Interest Rate Caps |  |
Assets |  |
Interest rate derivative assets | 597 | 415
Fair Value | Interest Rate Swap |  |
Assets |  |
Interest rate derivative assets | 354 | 0
Liabilities |  |
Interest rate derivative liabilities | $ 0 | $ 789

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