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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 10,578,982	$ 2,437,278
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	513,764	73,639
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	822,840	1,068,336
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	105,483	59,659
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	11,401,822	3,505,614
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	619,247	133,298
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	9,930,955	1,967,870
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	434,506	40,328
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	658,939	1,016,797
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	60,939	48,854
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	10,589,894	2,984,667
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	495,445	89,182
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	6,388,148	1,225,767
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	323,961	27,784
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	294,755	614,294
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	40,861	30,040
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	6,682,903	1,840,061
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	364,822	57,824
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Canadian Provincial Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	122,746	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	2,532	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	1,235
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	7
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	122,746	1,235
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	2,532	7
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Residential Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	452,297	78,864
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	7,036	846
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	82,314	135,414
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	4,057	5,247
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	534,611	214,278
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	11,093	6,093
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	581,701	332,785
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	9,825	4,021
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	199,298	109,411
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	7,100	4,289
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	780,999	442,196
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	16,925	8,310
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	514,877	78,632
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	9,806	564
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	31,177	28,375
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	997	2,461
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	546,054	107,007
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	10,803	3,025
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,010,387	81,317
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	57,718	89
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	32,959
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	426
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,010,387	114,276
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	57,718	515
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	157,837	13,780
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	5,349	17
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	13,016	18,998
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	3,718	3,438
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	170,853	32,778
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	9,067	3,455
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	702,962	156,725
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	18,279	7,007
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	38,379	76,111
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	4,206	2,946
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	741,341	232,836
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	22,485	9,953
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	648,027	469,408
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	79,258	33,311
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	163,901	51,539
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	44,544	10,805
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	811,928	520,947
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	123,802	44,116
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	554,688	415,886
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	71,171	29,316
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	114,427	32,567
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	31,076	3,404
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	669,115	448,453
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	102,247	32,720
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Residential Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	22,646	22,836
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	282	293
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	7,679	6,284
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	298	225
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	30,325	29,120
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	580	518
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	6,772	12,448
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	201	274
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	9,335	7,108
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	1,250	1,791
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	16,107	19,556
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	1,451	2,065
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,253	3,288
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	248	249
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	767	5,580
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	117	5,385
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4,020	8,868
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	365	5,634
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		964
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		43
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		964
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		43
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	60,668	13,986
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	7,356	3,136
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	31,693	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	11,803	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	92,361	13,986
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	19,159	3,136
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	50,658	11,619
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	4,417	235
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	12,191	22,645
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	3,787	1,386
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	62,849	34,264
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	8,204	1,621
Equity Securities [Member] | Nonredeemable Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	12,331	11,619
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	2,175	235
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	12,191	19,100
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	3,787	1,292
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	24,522	30,719
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	5,962	1,527
Equity Securities [Member] | Equity Securities Other Than Non-redeemable Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	38,327	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	2,242	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	3,545
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	94
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	38,327	3,545
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	$ 2,242	$ 94

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Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer.

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-Publisher FASB
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