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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investment Holdings [Line Items] |  |
Held for investment, amortized cost | $ 77,041 | $ 76,825
Held for investment, fair value | 76,460 | 68,766
Fixed Maturity Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 43,116,759 | 39,953,955
Available for sale securities, gross unrealized gains | 2,525,131 | 1,691,257
Available for sale securities, gross unrealized losses | (268,901) | (584,718)
Available for sale securities, fair value | 45,372,989 | 41,060,494
Equity Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 292,429 | 7,521
Available for sale securities, gross unrealized gains | 0 | 479
Available for sale securities, gross unrealized losses | 0 | 0
Available for sale securities, fair value | 292,429 | 8,000
United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 11,861 | 11,864
Available for sale securities, gross unrealized gains | 162 | 229
Available for sale securities, gross unrealized losses | (147) | (288)
Available for sale securities, fair value | 11,876 | 11,805
United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 1,308,290 | 1,368,340
Available for sale securities, gross unrealized gains | 28,457 | 23,360
Available for sale securities, gross unrealized losses | (31,730) | (46,913)
Available for sale securities, fair value | 1,305,017 | 1,344,787
United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 3,804,360 | 3,626,395
Available for sale securities, gross unrealized gains | 366,048 | 322,948
Available for sale securities, gross unrealized losses | (3,596) | (22,393)
Available for sale securities, fair value | 4,166,812 | 3,926,950
Foreign Government Obligations [Member] | Fixed Maturity Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 228,214 | 229,589
Available for sale securities, gross unrealized gains | 13,171 | 11,832
Available for sale securities, gross unrealized losses | (2,025) | (5,080)
Available for sale securities, fair value | 239,360 | 236,341
Corporate Securities [Member] | Fixed Maturity Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 28,127,653 | 26,333,213
Available for sale securities, gross unrealized gains | 1,897,005 | 1,149,978
Available for sale securities, gross unrealized losses | (145,687) | (368,773)
Available for sale securities, fair value | 29,878,971 | 27,114,418
Held for investment, amortized cost | 77,041 | 76,825
Held for investment, gross unrealized gains | 0 | 0
Held for investment, gross unrealized losses | (581) | (8,059)
Held for investment, fair value | 76,460 | 68,766
Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 1,028,484 | 1,166,944
Available for sale securities, gross unrealized gains | 79,554 | 91,445
Available for sale securities, gross unrealized losses | (2,471) | (3,554)
Available for sale securities, fair value | 1,105,567 | 1,254,835
Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 5,531,922 | 5,422,255
Available for sale securities, gross unrealized gains | 82,768 | 59,994
Available for sale securities, gross unrealized losses | (69,840) | (117,014)
Available for sale securities, fair value | 5,544,850 | 5,365,235
Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 3,075,975 | 1,795,355
Available for sale securities, gross unrealized gains | 57,966 | 31,471
Available for sale securities, gross unrealized losses | (13,405) | (20,703)
Available for sale securities, fair value | $ 3,120,536 | $ 1,806,123

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