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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investment Holdings [Line Items] |  |
Held for investment, amortized cost | $ 76,825 | $ 76,622
Held for investment, fair value | 68,766 | 65,377
Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 39,953,955 | 35,823,710
Available for sale securities, gross unrealized gains | 1,691,257 | 1,443,474
Available for sale securities, gross unrealized losses | (584,718) | (845,345)
Available for sale securities, fair value | 41,060,494 | 36,421,839
Equity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 7,521 | 7,515
Available for sale securities, gross unrealized gains | 479 | 313
Available for sale securities, gross unrealized losses | 0 | 0
Available for sale securities, fair value | 8,000 | 7,828
United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 11,864 | 470,567
Available for sale securities, gross unrealized gains | 229 | 988
Available for sale securities, gross unrealized losses | (288) | (299)
Available for sale securities, fair value | 11,805 | 471,256
United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 1,368,340 | 1,386,219
Available for sale securities, gross unrealized gains | 23,360 | 26,801
Available for sale securities, gross unrealized losses | (46,913) | (14,409)
Available for sale securities, fair value | 1,344,787 | 1,398,611
United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 3,626,395 | 3,422,667
Available for sale securities, gross unrealized gains | 322,948 | 341,328
Available for sale securities, gross unrealized losses | (22,393) | (8,628)
Available for sale securities, fair value | 3,926,950 | 3,755,367
Foreign Government Obligations [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 224,588 | 210,953
Available for sale securities, gross unrealized gains | 12,725 | 12,547
Available for sale securities, gross unrealized losses | (5,080) | (10,935)
Available for sale securities, fair value | 232,233 | 212,565
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 26,338,214 | 23,597,530
Available for sale securities, gross unrealized gains | 1,149,085 | 887,288
Available for sale securities, gross unrealized losses | (368,773) | (682,424)
Available for sale securities, fair value | 27,118,526 | 23,802,394
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Held For Investment [Member] |  |
Investment Holdings [Line Items] |  |
Held for investment, amortized cost | 76,825 | 76,622
Held for investment, gross unrealized gains | 0 | 0
Held for investment, gross unrealized losses | (8,059) | (11,245)
Held for investment, fair value | 68,766 | 65,377
Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 1,166,944 | 1,366,985
Available for sale securities, gross unrealized gains | 91,445 | 98,576
Available for sale securities, gross unrealized losses | (3,554) | (3,489)
Available for sale securities, fair value | 1,254,835 | 1,462,072
Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 5,422,255 | 4,238,265
Available for sale securities, gross unrealized gains | 59,994 | 41,412
Available for sale securities, gross unrealized losses | (117,014) | (105,281)
Available for sale securities, fair value | 5,365,235 | 4,174,396
Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 1,795,355 | 1,130,524
Available for sale securities, gross unrealized gains | 31,471 | 34,534
Available for sale securities, gross unrealized losses | (20,703) | (19,880)
Available for sale securities, fair value | $ 1,806,123 | $ 1,145,178

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