Investments (Details 2) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	$ 204,664	$ 69,666
Less Than 12 Months Gross Unrealized Losses	(3,953)	(760)
12 Months or More Fair Value	84,301	158,870
12 Months or More Gross Unrealized Losses	(7,358)	(5,879)
Total Fair Value	288,965	228,536
Total Gross Unrealized Losses	(11,311)	(6,639)
Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	195,322	68,305
Less Than 12 Months Gross Unrealized Losses	(3,688)	(555)
12 Months or More Fair Value	72,230	148,249
12 Months or More Gross Unrealized Losses	(5,822)	(4,459)
Total Fair Value	267,552	216,554
Total Gross Unrealized Losses	(9,510)	(5,014)
State and municipal
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	9,587	3,197
Less Than 12 Months Gross Unrealized Losses	$ (41)	(176)
12 Months or More Fair Value		247
12 Months or More Gross Unrealized Losses		(2)
Total Fair Value	$ 9,587	3,444
Total Gross Unrealized Losses	(41)	(178)
Residential mortgage-backed
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	23,275	2,072
Less Than 12 Months Gross Unrealized Losses	(161)	(2)
12 Months or More Fair Value	43,109	47,594
12 Months or More Gross Unrealized Losses	(1,233)	(1,407)
Total Fair Value	66,384	49,666
Total Gross Unrealized Losses	(1,394)	(1,409)
Corporate
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	118,402	25,885
Less Than 12 Months Gross Unrealized Losses	(3,363)	(235)
12 Months or More Fair Value	4,817	22,353
12 Months or More Gross Unrealized Losses	(4,524)	(2,199)
Total Fair Value	123,219	48,238
Total Gross Unrealized Losses	(7,887)	(2,434)
Commercial mortgage and asset-backed
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	42,098	23,894
Less Than 12 Months Gross Unrealized Losses	(58)	(118)
12 Months or More Fair Value	18,055	8,742
12 Months or More Gross Unrealized Losses	(59)	(26)
Total Fair Value	60,153	32,636
Total Gross Unrealized Losses	$ (117)	(144)
Obligations of U.S. government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value		$ 202
Less Than 12 Months Gross Unrealized Losses
12 Months or More Fair Value	$ 4,047	$ 48,029
12 Months or More Gross Unrealized Losses	(3)	(532)
Total Fair Value	4,047	48,231
Total Gross Unrealized Losses	$ (3)	(532)
U.S. Treasury securities and obligations guaranteed by the U.S. government
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value		13,055
Less Than 12 Months Gross Unrealized Losses		(24)
12 Months or More Fair Value	$ 2,202	19,383
12 Months or More Gross Unrealized Losses	(3)	(169)
Total Fair Value	2,202	32,438
Total Gross Unrealized Losses	(3)	$ (193)
Redeemable preferred stock
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	1,960
Less Than 12 Months Gross Unrealized Losses	$ (65)
12 Months or More Fair Value		$ 1,901
12 Months or More Gross Unrealized Losses		(124)
Total Fair Value	$ 1,960	1,901
Total Gross Unrealized Losses	(65)	(124)
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	9,342	1,361
Less Than 12 Months Gross Unrealized Losses	(265)	(205)
12 Months or More Fair Value	12,071	10,621
12 Months or More Gross Unrealized Losses	(1,536)	(1,420)
Total Fair Value	21,413	11,982
Total Gross Unrealized Losses	$ (1,801)	$ (1,625)