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Fair Values of Financial Instruments (Fair Values and Carrying Amounts of Financial Instruments) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets |  |
Held for investment | $ 68,542 | $ 65,377
Other investments | 292,776 | 291,530
Coinsurance deposits | 4,120,911 | 3,187,470
Liabilities |  |
Policy benefit reserves | 49,432,481 | 45,495,431
Carrying Amount [Member] |  |
Assets |  |
Mortgage loans on real estate | 2,451,375 | 2,435,257
Derivative instruments | 576,262 | 337,256
Other investments | 292,776 | 285,044
Cash and cash equivalents | 1,547,041 | 397,749
Coinsurance deposits | 4,120,911 | 3,187,470
Counterparty collateral | 91,457 | 82,312
Liabilities |  |
Policy benefit reserves | 49,086,249 | 45,151,460
Single premium immediate annuity (SPIA) benefit reserves | 304,365 | 324,264
Notes payable | 393,739 | 393,227
Subordinated debentures | 241,650 | 241,452
Carrying Amount [Member] | Interest Rate Caps [Member] |  |
Assets |  |
Interest rate derivative assets | 427 | 1,410
Carrying Amount [Member] | Interest Rate Swap [Member] |  |
Liabilities |  |
Interest rate derivative liabilities | 5,971 | 3,139
Carrying Amount [Member] | Fixed Maturity Securities [Member] |  |
Assets |  |
Available for sale securities | 39,863,803 | 36,421,839
Held for investment | 76,722 | 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 | 2,478,023 | 2,471,864
Derivative instruments | 576,262 | 337,256
Other investments | 291,107 | 290,075
Cash and cash equivalents | 1,547,041 | 397,749
Coinsurance deposits | 3,700,449 | 2,860,882
Counterparty collateral | 91,457 | 82,312
Liabilities |  |
Policy benefit reserves | 41,155,256 | 38,435,515
Single premium immediate annuity (SPIA) benefit reserves | 315,420 | 336,066
Notes payable | 424,804 | 417,752
Subordinated debentures | 229,881 | 216,933
Fair Value [Member] | Interest Rate Caps [Member] |  |
Assets |  |
Interest rate derivative assets | 427 | 1,410
Fair Value [Member] | Interest Rate Swap [Member] |  |
Liabilities |  |
Interest rate derivative liabilities | 5,971 | 3,139
Fair Value [Member] | Fixed Maturity Securities [Member] |  |
Assets |  |
Available for sale securities | 39,863,803 | 36,421,839
Held for investment | 68,542 | 65,377
Fair Value [Member] | Equity Securities [Member] |  |
Assets |  |
Available for sale securities | $ 7,813 | $ 7,828

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- Definition Amount of the reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.2,10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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