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Investments (Schedule of Amortized Cost and Fair Value of Fixed Maturity and Equity Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investment Holdings [Line Items] |  |
Held for investment, amortized cost | $ 76,878 | $ 76,825
Held for investment | 70,795 | 68,766
Fixed Maturity Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 40,717,733 | 39,953,955
Available for sale, gross unrealized gains | 1,848,086 | 1,691,257
Available for sale, gross unrealized losses | (460,453) | (584,718)
Available for sale, fair value | 42,105,366 | 41,060,494
Fixed Maturity Securities [Member] | United States Government Full Faith and Credit [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 11,699 | 11,864
Available for sale, gross unrealized gains | 225 | 229
Available for sale, gross unrealized losses | (252) | (288)
Available for sale, fair value | 11,672 | 11,805
Fixed Maturity Securities [Member] | United States Government Sponsored Agencies [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 1,368,361 | 1,368,340
Available for sale, gross unrealized gains | 25,803 | 23,360
Available for sale, gross unrealized losses | (53,376) | (46,913)
Available for sale, fair value | 1,340,788 | 1,344,787
Fixed Maturity Securities [Member] | United States Municipalities, States and Territories [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 3,673,722 | 3,626,395
Available for sale, gross unrealized gains | 334,483 | 322,948
Available for sale, gross unrealized losses | (18,903) | (22,393)
Available for sale, fair value | 3,989,302 | 3,926,950
Fixed Maturity Securities [Member] | Foreign Government Obligations [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 228,998 | 229,589
Available for sale, gross unrealized gains | 12,047 | 11,832
Available for sale, gross unrealized losses | (2,647) | (5,080)
Available for sale, fair value | 238,398 | 236,341
Fixed Maturity Securities [Member] | Corporate Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 27,149,697 | 26,333,213
Available for sale, gross unrealized gains | 1,289,415 | 1,149,978
Available for sale, gross unrealized losses | (278,492) | (368,773)
Available for sale, fair value | 28,160,620 | 27,114,418
Held for investment, amortized cost | 76,878 | 76,825
Held for investment, gross unrealized gains | 0 | 0
Held for investment, gross unrealized losses | (6,083) | (8,059)
Held for investment | 70,795 | 68,766
Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 1,119,318 | 1,166,944
Available for sale, gross unrealized gains | 84,885 | 91,445
Available for sale, gross unrealized losses | (4,163) | (3,554)
Available for sale, fair value | 1,200,040 | 1,254,835
Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 5,406,475 | 5,422,255
Available for sale, gross unrealized gains | 65,691 | 59,994
Available for sale, gross unrealized losses | (88,224) | (117,014)
Available for sale, fair value | 5,383,942 | 5,365,235
Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 1,759,463 | 1,795,355
Available for sale, gross unrealized gains | 35,537 | 31,471
Available for sale, gross unrealized losses | (14,396) | (20,703)
Available for sale, fair value | 1,780,604 | 1,806,123
Equity Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 7,524 | 7,521
Available for sale, gross unrealized gains | 466 | 479
Available for sale, gross unrealized losses | 0 | 0
Available for sale, fair value | $ 7,990 | $ 8,000

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