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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | $ 46,727,050 | $ 46,131,190
Fixed maturity securities, available for sale, gross unrealized gains | 1,890,597 | 1,143,624
Fixed maturity securities, available for sale, gross unrealized losses | (580,540) | (1,351,087)
Fixed maturity securities, available for sale, fair value | 48,037,107 | 45,923,727
United States Government Full Faith and Credit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 11,707 | 11,872
Fixed maturity securities, available for sale, gross unrealized gains | 138 | 102
Fixed maturity securities, available for sale, gross unrealized losses | (144) | (322)
Fixed maturity securities, available for sale, fair value | 11,701 | 11,652
United States Government Sponsored Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 1,208,461 | 1,208,468
Fixed maturity securities, available for sale, gross unrealized gains | 18,707 | 13,095
Fixed maturity securities, available for sale, gross unrealized losses | (39,828) | (83,034)
Fixed maturity securities, available for sale, fair value | 1,187,340 | 1,138,529
United States Municipalities, States and Territories |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 3,861,080 | 3,880,703
Fixed maturity securities, available for sale, gross unrealized gains | 317,345 | 261,222
Fixed maturity securities, available for sale, gross unrealized losses | (3,579) | (15,658)
Fixed maturity securities, available for sale, fair value | 4,174,846 | 4,126,267
Foreign Government Obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 226,233 | 226,860
Fixed maturity securities, available for sale, gross unrealized gains | 10,960 | 7,573
Fixed maturity securities, available for sale, gross unrealized losses | (1,651) | (4,159)
Fixed maturity securities, available for sale, fair value | 235,542 | 230,274
Corporate Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 29,025,709 | 28,483,138
Fixed maturity securities, available for sale, gross unrealized gains | 1,312,764 | 727,105
Fixed maturity securities, available for sale, gross unrealized losses | (324,276) | (838,729)
Fixed maturity securities, available for sale, fair value | 30,014,197 | 28,371,514
Residential Mortgage Backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 1,116,718 | 1,134,623
Fixed maturity securities, available for sale, gross unrealized gains | 86,066 | 71,661
Fixed maturity securities, available for sale, gross unrealized losses | (1,452) | (4,125)
Fixed maturity securities, available for sale, fair value | 1,201,332 | 1,202,159
Commercial Mortgage Backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 5,493,082 | 5,492,271
Fixed maturity securities, available for sale, gross unrealized gains | 90,317 | 21,558
Fixed maturity securities, available for sale, gross unrealized losses | (39,887) | (134,826)
Fixed maturity securities, available for sale, fair value | 5,543,512 | 5,379,003
Other Asset Backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 5,784,060 | 5,693,255
Fixed maturity securities, available for sale, gross unrealized gains | 54,300 | 41,308
Fixed maturity securities, available for sale, gross unrealized losses | (169,723) | (270,234)
Fixed maturity securities, available for sale, fair value | $ 5,668,637 | $ 5,464,329

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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