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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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