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Investments (Details 3) $ in Thousands	Dec. 31, 2016 USD ($) Number	Dec. 31, 2015 USD ($) Number
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	$ 1,994,925	$ 2,304,060
Fixed maturity securities, Fair Value, More than 12 Months	307,486	224,513
Fixed maturity securities, Fair Value, Total	2,302,411	2,528,573
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	61,692	74,011
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	14,292	19,842
Fixed maturity securities, Gross Unrealized Losses, Total	$ 75,984	$ 93,853
Number of positions with a gross unrealized loss position, 12 Months or Less | Number	629	684
Number of position with a gross unrealized loss position, more than 12 months | Number	102	78
Number of position with a gross unrealized loss position, Total | Number	731	762
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less	26.30%	32.00%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months	4.00%	3.10%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total	30.30%	35.10%
Mortgage-backed securities [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	$ 76,573	$ 48,097
Fixed maturity securities, Fair Value, More than 12 Months	3,235	1,595
Fixed maturity securities, Fair Value, Total	79,808	49,692
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	3,096	1,748
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	544	113
Fixed maturity securities, Gross Unrealized Losses, Total	3,640	1,861
Other [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	219,372	248,478
Fixed maturity securities, Fair Value, More than 12 Months	0	1,921
Fixed maturity securities, Fair Value, Total	219,372	250,399
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	10,120	7,338
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	0	77
Fixed maturity securities, Gross Unrealized Losses, Total	10,120	7,415
Municipal bonds [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	408,163	168,939
Fixed maturity securities, Fair Value, More than 12 Months	9,928	21,717
Fixed maturity securities, Fair Value, Total	418,091	190,656
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	19,006	5,382
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	3,582	4,958
Fixed maturity securities, Gross Unrealized Losses, Total	22,588	10,340
Foreign government bonds [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	24,182	11,867
Fixed maturity securities, Fair Value, More than 12 Months	0	0
Fixed maturity securities, Fair Value, Total	24,182	11,867
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	297	112
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	0	0
Fixed maturity securities, Gross Unrealized Losses, Total	297	112
Corporate bonds [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	459,402	858,647
Fixed maturity securities, Fair Value, More than 12 Months	57,261	50,340
Fixed maturity securities, Fair Value, Total	516,663	908,987
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	11,056	37,244
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	3,770	11,590
Fixed maturity securities, Gross Unrealized Losses, Total	14,826	48,834
Other mortgage-backed securities [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	750,557	929,268
Fixed maturity securities, Fair Value, More than 12 Months	229,106	140,561
Fixed maturity securities, Fair Value, Total	979,663	1,069,829
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	13,550	19,165
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	5,389	1,796
Fixed maturity securities, Gross Unrealized Losses, Total	18,939	20,961
Total fixed maturity securities [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	1,938,249	2,265,296
Fixed maturity securities, Fair Value, More than 12 Months	299,530	216,134
Fixed maturity securities, Fair Value, Total	2,237,779	2,481,430
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	57,125	70,989
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	13,285	18,534
Fixed maturity securities, Gross Unrealized Losses, Total	70,410	89,523
Equity securities [Member]
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	56,676	38,764	[1]
Fixed maturity securities, Fair Value, More than 12 Months	7,956	8,379	[1]
Fixed maturity securities, Fair Value, Total	64,632	47,143	[1]
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	4,567	3,022	[1]
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	1,007	1,308	[1]
Fixed maturity securities, Gross Unrealized Losses, Total	$ 5,574	$ 4,330	[1]
[1] Includes nonredeemable (perpetual) preferred stocks, common stocks and closed-end funds.

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