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Investments (Details 1) $ in Thousands		Sep. 30, 2016 USD ($) Number	Dec. 31, 2015 USD ($) Number
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		$ 487,399	$ 2,304,060
Fixed maturity securities, Fair Value, More than 12 Months		300,179	224,513
Fixed maturity securities, Fair Value, Total		787,578	2,528,573
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		9,057	74,011
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		14,174	19,842
Fixed maturity securities, Gross Unrealized Losses, Total		$ 23,231	$ 93,853
Number of positions with a gross unrealized loss position, 12 Months or Less | Number		201	684
Number of position with a gross unrealized loss position, more than 12 months | Number		107	78
Number of position with a gross unrealized loss position, Total | Number		308	762
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less		6.40%	32.00%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months		3.90%	3.10%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total		10.30%	35.10%
Mortgage-backed securities [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		$ 9,701	$ 48,097
Fixed maturity securities, Fair Value, More than 12 Months		3,564	1,595
Fixed maturity securities, Fair Value, Total		13,265	49,692
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		60	1,748
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		207	113
Fixed maturity securities, Gross Unrealized Losses, Total		267	1,861
Other [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		27,728	248,478
Fixed maturity securities, Fair Value, More than 12 Months		0	1,921
Fixed maturity securities, Fair Value, Total		27,728	250,399
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		272	7,338
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		0	77
Fixed maturity securities, Gross Unrealized Losses, Total		272	7,415
Municipal bonds [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		53,583	168,939
Fixed maturity securities, Fair Value, More than 12 Months		16,768	21,717
Fixed maturity securities, Fair Value, Total		70,351	190,656
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		879	5,382
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		3,891	4,958
Fixed maturity securities, Gross Unrealized Losses, Total		4,770	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		114,009	858,647
Fixed maturity securities, Fair Value, More than 12 Months		63,800	50,340
Fixed maturity securities, Fair Value, Total		177,809	908,987
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		1,514	37,244
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		5,244	11,590
Fixed maturity securities, Gross Unrealized Losses, Total		6,758	48,834
Other mortgage-backed securities [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		266,884	929,268
Fixed maturity securities, Fair Value, More than 12 Months		207,444	140,561
Fixed maturity securities, Fair Value, Total		474,328	1,069,829
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		5,447	19,165
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		4,196	1,796
Fixed maturity securities, Gross Unrealized Losses, Total		9,643	20,961
Total fixed maturity securities [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less		471,905	2,265,296
Fixed maturity securities, Fair Value, More than 12 Months		291,576	216,134
Fixed maturity securities, Fair Value, Total		763,481	2,481,430
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less		8,172	70,989
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months		13,538	18,534
Fixed maturity securities, Gross Unrealized Losses, Total		21,710	89,523
Equity securities [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	[1]	15,494	38,764
Fixed maturity securities, Fair Value, More than 12 Months	[1]	8,603	8,379
Fixed maturity securities, Fair Value, Total	[1]	24,097	47,143
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	[1]	885	3,022
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	[1]	636	1,308
Fixed maturity securities, Gross Unrealized Losses, Total	[1]	$ 1,521	$ 4,330
[1] Includes nonredeemable (perpetual) preferred stocks, common stocks and closed-end funds.

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