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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | $ 47,477,956 | $ 46,131,190
Fixed maturity securities, available for sale, fair value | 50,171,303 | 45,923,727
NAIC, Class 1 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 27,355,251 | 26,588,352
Fixed maturity securities, available for sale, fair value | 29,363,924 | 26,921,843
NAIC, Class 2 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 18,674,100 | 17,901,161
Fixed maturity securities, available for sale, fair value | 19,421,029 | 17,528,072
NAIC, Class 3 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 1,250,071 | 1,396,650
Fixed maturity securities, available for sale, fair value | 1,213,115 | 1,269,242
NAIC, Class 4 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 193,004 | 173,987
Fixed maturity securities, available for sale, fair value | 166,568 | 137,991
NAIC, Class 5 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 0 | 23,836
Fixed maturity securities, available for sale, fair value | 0 | 19,453
NAIC, Class 6 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 5,530 | 47,204
Fixed maturity securities, available for sale, fair value | $ 6,667 | $ 47,126

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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