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Investments (Details 1) $ in Thousands		Jun. 30, 2016 USD ($) Number	Dec. 31, 2015 USD ($) Number
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		$ 729,180	$ 2,304,060
Fixed maturity securities, Fair Value, More than 12 Months		423,940	224,513
Fixed maturity securities, Fair Value, Total		1,153,120	2,528,573
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		16,413	74,011
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		20,491	19,842
Fixed maturity securities, Gross Unrealized Losses, Total		$ 36,904	$ 93,853
Number of positions with a gross unrealized loss position, 12 Months or Less | Number		245	684
Number of position with a gross unrealized loss position, more than 12 months | Number		142	78
Number of position with a gross unrealized loss position, Total | Number		387	762
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less		9.60%	32.00%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months		5.60%	3.10%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total		15.20%	35.10%
Mortgage-backed securities [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		$ 455	$ 48,097
Fixed maturity securities, Fair Value, More than 12 Months		3,212	1,595
Fixed maturity securities, Fair Value, Total		3,667	49,692
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		12	1,748
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		214	113
Fixed maturity securities, Gross Unrealized Losses, Total		226	1,861
Other [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		8,944	248,478
Fixed maturity securities, Fair Value, More than 12 Months		0	1,921
Fixed maturity securities, Fair Value, Total		8,944	250,399
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		56	7,338
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		0	77
Fixed maturity securities, Gross Unrealized Losses, Total		56	7,415
Municipal bonds [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		8,862	168,939
Fixed maturity securities, Fair Value, More than 12 Months		25,788	21,717
Fixed maturity securities, Fair Value, Total		34,650	190,656
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		82	5,382
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		4,802	4,958
Fixed maturity securities, Gross Unrealized Losses, Total		4,884	10,340
Foreign government bonds [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		0	11,867
Fixed maturity securities, Fair Value, More than 12 Months		0	0
Fixed maturity securities, Fair Value, Total		0	11,867
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		0	112
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		0	0
Fixed maturity securities, Gross Unrealized Losses, Total		0	112
Corporate bonds [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		106,822	858,647
Fixed maturity securities, Fair Value, More than 12 Months		106,679	50,340
Fixed maturity securities, Fair Value, Total		213,501	908,987
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		3,314	37,244
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		7,983	11,590
Fixed maturity securities, Gross Unrealized Losses, Total		11,297	48,834
Other mortgage-backed securities [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		596,827	929,268
Fixed maturity securities, Fair Value, More than 12 Months		280,231	140,561
Fixed maturity securities, Fair Value, Total		877,058	1,069,829
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		12,447	19,165
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		6,575	1,796
Fixed maturity securities, Gross Unrealized Losses, Total		19,022	20,961
Total fixed maturity securities [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		721,910	2,265,296
Fixed maturity securities, Fair Value, More than 12 Months		415,910	216,134
Fixed maturity securities, Fair Value, Total		1,137,820	2,481,430
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		15,911	70,989
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		19,574	18,534
Fixed maturity securities, Gross Unrealized Losses, Total		35,485	89,523
Equity securities [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	[1]	7,270	38,764
Fixed maturity securities, Fair Value, More than 12 Months	[1]	8,030	8,379
Fixed maturity securities, Fair Value, Total	[1]	15,300	47,143
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	[1]	502	3,022
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	[1]	917	1,308
Fixed maturity securities, Gross Unrealized Losses, Total	[1]	$ 1,419	$ 4,330
[1] Includes nonredeemable (perpetual) preferred stocks, common stocks and closed-end funds.

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