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Investments (Details 1) $ in Thousands		Mar. 31, 2016 USD ($) Number	Dec. 31, 2015 USD ($) Number
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		$ 1,383,241	$ 2,304,060
Fixed maturity securities, Fair Value, More than 12 Months		263,846	224,513
Fixed maturity securities, Fair Value, Total		1,647,087	2,528,573
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		47,633	74,011
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		20,065	19,842
Fixed maturity securities, Gross Unrealized Losses, Total		$ 67,698	$ 93,853
Number of positions with a gross unrealized loss position, 12 Months or Less | Number		421	684
Number of position with a gross unrealized loss position, more than 12 months | Number		93	78
Number of position with a gross unrealized loss position, Total | Number		514	762
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less		18.90%	32.00%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months		3.60%	3.10%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total		22.50%	35.10%
Mortgage-backed securities [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		$ 3,919	$ 48,097
Fixed maturity securities, Fair Value, More than 12 Months		2,918	1,595
Fixed maturity securities, Fair Value, Total		6,837	49,692
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		188	1,748
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		283	113
Fixed maturity securities, Gross Unrealized Losses, Total		471	1,861
Other [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		10,000	248,478
Fixed maturity securities, Fair Value, More than 12 Months		0	1,921
Fixed maturity securities, Fair Value, Total		10,000	250,399
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		0	7,338
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		0	77
Fixed maturity securities, Gross Unrealized Losses, Total		0	7,415
Municipal bonds [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		37,752	168,939
Fixed maturity securities, Fair Value, More than 12 Months		12,324	21,717
Fixed maturity securities, Fair Value, Total		50,076	190,656
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		4,056	5,382
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		3,143	4,958
Fixed maturity securities, Gross Unrealized Losses, Total		7,199	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		435,489	858,647
Fixed maturity securities, Fair Value, More than 12 Months		64,934	50,340
Fixed maturity securities, Fair Value, Total		500,423	908,987
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		16,822	37,244
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		11,521	11,590
Fixed maturity securities, Gross Unrealized Losses, Total		28,343	48,834
Other mortgage-backed securities [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		884,292	929,268
Fixed maturity securities, Fair Value, More than 12 Months		174,345	140,561
Fixed maturity securities, Fair Value, Total		1,058,637	1,069,829
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		24,692	19,165
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		3,895	1,796
Fixed maturity securities, Gross Unrealized Losses, Total		28,587	20,961
Total fixed maturity securities [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		1,371,452	2,265,296
Fixed maturity securities, Fair Value, More than 12 Months		254,521	216,134
Fixed maturity securities, Fair Value, Total		1,625,973	2,481,430
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		45,758	70,989
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		18,842	18,534
Fixed maturity securities, Gross Unrealized Losses, Total		64,600	89,523
Equity securities [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	[1]	11,789	38,764
Fixed maturity securities, Fair Value, More than 12 Months	[1]	9,325	8,379
Fixed maturity securities, Fair Value, Total	[1]	21,114	47,143
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	[1]	1,875	3,022
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	[1]	1,223	1,308
Fixed maturity securities, Gross Unrealized Losses, Total	[1]	$ 3,098	$ 4,330
[1] Includes nonredeemable (perpetual) preferred stocks, common stocks and closed-end funds.

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