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Fair Values of Financial Instruments (Carrying Amounts and Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Held for investment | $ 76,460 | $ 68,766
Other investments | 616,764 | 308,774
Coinsurance deposits | 4,858,289 | 4,639,492
Liabilities |  |
Policy benefit reserves | 56,142,673 | 51,637,026
Interest Rate Caps [Member] |  |
Assets |  |
Derivative assets | 415 | 1,082
Carrying Amount [Member] |  |
Assets |  |
Available for sale securities | 45,372,989 | 41,060,494
Held for investment | 77,041 | 76,825
Mortgage loans on real estate | 2,665,531 | 2,480,956
Derivative assets | 1,568,380 | 830,519
Other investments | 616,764 | 308,774
Cash and cash equivalents | 1,434,045 | 791,266
Coinsurance deposits | 4,858,289 | 4,639,492
Counterparty collateral | 186,108 | 145,693
Liabilities |  |
Policy benefit reserves | 55,786,011 | 51,280,331
Single premium immediate annuity (SPIA) benefit reserves | 282,563 | 297,724
Notes and loan payable | 494,093 | 493,755
Subordinated debentures | 242,565 | 241,853
Carrying Amount [Member] | Interest Rate Caps [Member] |  |
Assets |  |
Interest rate derivative assets | 415 | 1,082
Carrying Amount [Member] | Interest Rate Swap [Member] |  |
Liabilities |  |
Interest rate derivative liabilities | 789 | 2,113
Fair Value [Member] |  |
Assets |  |
Available for sale securities | 45,372,989 | 41,060,494
Held for investment | 76,460 | 68,766
Mortgage loans on real estate | 2,670,037 | 2,522,035
Derivative assets | 1,568,380 | 830,519
Other investments | 605,894 | 300,918
Cash and cash equivalents | 1,434,045 | 791,266
Coinsurance deposits | 4,347,990 | 4,150,792
Counterparty collateral | 186,108 | 145,693
Liabilities |  |
Policy benefit reserves | 46,344,931 | 43,104,183
Single premium immediate annuity (SPIA) benefit reserves | 292,153 | 308,028
Notes and loan payable | 521,800 | 519,440
Subordinated debentures | 244,117 | 225,106
Fair Value [Member] | Interest Rate Caps [Member] |  |
Assets |  |
Interest rate derivative assets | 415 | 1,082
Fair Value [Member] | Interest Rate Swap [Member] |  |
Liabilities |  |
Interest rate derivative liabilities | $ 789 | $ 2,113

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