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Investments (Fixed Maturity Securities Pledged And Received As Collateral) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 21,252,180 | $ 18,924,711
Available-for-sale Securities | 22,341,661 | 19,619,084
Collateral Fixed Maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 69,849 | 207,066
Available-for-sale Securities | 74,441 | 210,676
Collateral Received Fixed Maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | 457,801 | 300,925
Reported Value Measurement [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets Held-in-trust | 14,706,225 | 12,135,258
Estimate of Fair Value Measurement [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets Held-in-trust | $ 15,723,178 | $ 12,874,370

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- Definition The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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