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Fair Values of Financial Instruments (Fair Values and Carrying Amounts of Financial Instruments) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Assets |  |
Held for investment | $ 67,672 | $ 65,377
Other investments | 290,556 | 291,530
Coinsurance deposits | 3,586,871 | 3,187,470
Liabilities |  |
Policy benefit reserves | 47,456,425 | 45,495,431
Carrying Amount [Member] |  |
Assets |  |
Mortgage loans on real estate | 2,471,435 | 2,435,257
Derivative instruments | 387,469 | 337,256
Other investments | 285,200 | 285,044
Cash and cash equivalents | 707,177 | 397,749
Coinsurance deposits | 3,586,871 | 3,187,470
Counterparty collateral | 85,477 | 82,312
Liabilities |  |
Policy benefit reserves | 47,113,312 | 45,151,460
Single premium immediate annuity (SPIA) benefit reserves | 313,559 | 324,264
Notes payable | 393,482 | 393,227
Subordinated debentures | 241,550 | 241,452
Carrying Amount [Member] | Interest Rate Caps [Member] |  |
Assets |  |
Interest rate derivative assets | 740 | 1,410
Carrying Amount [Member] | Interest Rate Swap [Member] |  |
Liabilities |  |
Interest rate derivative liabilities | 5,375 | 3,139
Carrying Amount [Member] | Fixed Maturity Securities [Member] |  |
Assets |  |
Available for sale securities | 38,410,000 | 36,421,839
Held for investment | 76,672 | 76,622
Carrying Amount [Member] | Equity Securities [Member] |  |
Assets |  |
Available for sale securities | 7,813 | 7,828
Fair Value [Member] |  |
Assets |  |
Mortgage loans on real estate | 2,504,371 | 2,471,864
Derivative instruments | 387,469 | 337,256
Other investments | 288,303 | 290,075
Cash and cash equivalents | 707,177 | 397,749
Coinsurance deposits | 3,220,784 | 2,860,882
Counterparty collateral | 85,477 | 82,312
Liabilities |  |
Policy benefit reserves | 39,941,007 | 38,435,515
Single premium immediate annuity (SPIA) benefit reserves | 325,251 | 336,066
Notes payable | 411,252 | 417,752
Subordinated debentures | 212,638 | 216,933
Fair Value [Member] | Interest Rate Caps [Member] |  |
Assets |  |
Interest rate derivative assets | 740 | 1,410
Fair Value [Member] | Interest Rate Swap [Member] |  |
Liabilities |  |
Interest rate derivative liabilities | 5,375 | 3,139
Fair Value [Member] | Fixed Maturity Securities [Member] |  |
Assets |  |
Available for sale securities | 38,410,000 | 36,421,839
Held for investment | 67,672 | 65,377
Fair Value [Member] | Equity Securities [Member] |  |
Assets |  |
Available for sale securities | $ 7,813 | $ 7,828

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