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Fair Values of Financial Instruments (Fair Values and Carrying Amounts of Financial Instruments) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Held for investment | $ 70,795 | $ 68,766
Other investments | 309,429 | 308,774
Coinsurance deposits | 4,630,422 | 4,639,492
Liabilities |  |
Policy benefit reserves | 52,701,412 | 51,637,026
Carrying Amount [Member] |  |
Assets |  |
Available for sale securities | 42,105,366 | 41,060,494
Held for investment | 76,878 | 76,825
Mortgage loans on real estate | 2,506,991 | 2,480,956
Derivative instruments | 1,033,552 | 830,519
Other investments | 309,429 | 308,774
Cash and cash equivalents | 1,172,748 | 791,266
Coinsurance deposits | 4,630,422 | 4,639,492
Counterparty collateral | 143,229 | 145,693
Liabilities |  |
Policy benefit reserves | 52,343,991 | 51,280,331
Single premium immediate annuity (SPIA) benefit reserves | 292,482 | 297,724
Notes and loan payable | 494,071 | 493,755
Subordinated debentures | 241,949 | 241,853
Carrying Amount [Member] | Interest Rate Caps [Member] |  |
Assets |  |
Interest rate derivative assets | 804 | 1,082
Carrying Amount [Member] | Interest Rate Swap [Member] |  |
Liabilities |  |
Interest rate derivative liabilities | 1,729 | 2,113
Fair Value [Member] |  |
Assets |  |
Available for sale securities | 42,105,366 | 41,060,494
Held for investment | 70,795 | 68,766
Mortgage loans on real estate | 2,510,066 | 2,522,035
Derivative instruments | 1,033,552 | 830,519
Other investments | 303,003 | 300,918
Cash and cash equivalents | 1,172,748 | 791,266
Coinsurance deposits | 4,137,329 | 4,150,792
Counterparty collateral | 143,229 | 145,693
Liabilities |  |
Policy benefit reserves | 43,847,625 | 43,104,183
Single premium immediate annuity (SPIA) benefit reserves | 302,808 | 308,028
Notes and loan payable | 518,500 | 519,440
Subordinated debentures | 230,855 | 225,106
Fair Value [Member] | Interest Rate Caps [Member] |  |
Assets |  |
Interest rate derivative assets | 804 | 1,082
Fair Value [Member] | Interest Rate Swap [Member] |  |
Liabilities |  |
Interest rate derivative liabilities | $ 1,729 | $ 2,113

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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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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