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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | $ 46,131,190 | $ 43,116,759
Available for sale securities, gross unrealized gains | 1,143,624 | 2,525,131
Available for sale securities, gross unrealized losses | (1,351,087) | (268,901)
Available for sale securities, fair value | 45,923,727 | 45,372,989
Held for investment, amortized cost | 0 | 77,041
Held for investment, fair value | 0 | 76,460
United States Government Full Faith and Credit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | 11,872 | 11,861
Available for sale securities, gross unrealized gains | 102 | 162
Available for sale securities, gross unrealized losses | (322) | (147)
Available for sale securities, fair value | 11,652 | 11,876
United States Government Sponsored Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | 1,208,468 | 1,308,290
Available for sale securities, gross unrealized gains | 13,095 | 28,457
Available for sale securities, gross unrealized losses | (83,034) | (31,730)
Available for sale securities, fair value | 1,138,529 | 1,305,017
United States Municipalities, States and Territories |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | 3,880,703 | 3,804,360
Available for sale securities, gross unrealized gains | 261,222 | 366,048
Available for sale securities, gross unrealized losses | (15,658) | (3,596)
Available for sale securities, fair value | 4,126,267 | 4,166,812
Foreign Government Obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | 226,860 | 228,214
Available for sale securities, gross unrealized gains | 7,573 | 13,171
Available for sale securities, gross unrealized losses | (4,159) | (2,025)
Available for sale securities, fair value | 230,274 | 239,360
Corporate Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | 28,483,138 | 28,127,653
Available for sale securities, gross unrealized gains | 727,105 | 1,897,005
Available for sale securities, gross unrealized losses | (838,729) | (145,687)
Available for sale securities, fair value | 28,371,514 | 29,878,971
Held for investment, amortized cost |  | 77,041
Held for investment, gross unrealized gains |  | 0
Held for investment, gross unrealized losses |  | (581)
Held for investment, fair value |  | 76,460
Residential Mortgage Backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | 1,134,623 | 1,028,484
Available for sale securities, gross unrealized gains | 71,661 | 79,554
Available for sale securities, gross unrealized losses | (4,125) | (2,471)
Available for sale securities, fair value | 1,202,159 | 1,105,567
Commercial Mortgage Backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | 5,492,271 | 5,531,922
Available for sale securities, gross unrealized gains | 21,558 | 82,768
Available for sale securities, gross unrealized losses | (134,826) | (69,840)
Available for sale securities, fair value | 5,379,003 | 5,544,850
Other Asset Backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | 5,693,255 | 3,075,975
Available for sale securities, gross unrealized gains | 41,308 | 57,966
Available for sale securities, gross unrealized losses | (270,234) | (13,405)
Available for sale securities, fair value | $ 5,464,329 | 3,120,536
Equity Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale equity securities, amortized cost |  | 292,429
Available for sale equity securities, gross unrealized gains |  | 0
Available for sale equity securities, gross unrealized losses |  | 0
Available for sale equity securities, fair value |  | $ 292,429

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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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