Investments (Details 3) $ in Thousands	Sep. 30, 2016 USD ($) Holdings	Dec. 31, 2015 USD ($) Holdings
Fair value
Less than 12 months	$ 123,262	$ 244,279
12 months or longer	34,845	48,518
Total	158,107	292,797
Unrealized losses
Less than 12 months	631	2,882
12 months or longer	1,279	3,151
Total	$ 1,910	$ 6,033
No. of holdings | Holdings	205	407
Investment grade
Fair value
Less than 12 months	$ 100,205	$ 174,723
12 months or longer	27,442	38,369
Total	127,647	213,092
Unrealized losses
Less than 12 months	296	1,296
12 months or longer	688	1,256
Total	$ 984	$ 2,552
No. of holdings | Holdings	79	105
Non-investment grade
Fair value
Less than 12 months	$ 23,057	$ 56,824
12 months or longer	7,403	10,149
Total	30,460	66,973
Unrealized losses
Less than 12 months	335	1,453
12 months or longer	591	1,895
Total	$ 926	$ 3,348
No. of holdings | Holdings	126	301
Fixed maturities
Fair value
Less than 12 months	$ 123,262	$ 231,547
12 months or longer	34,845	48,518
Total	158,107	280,065
Unrealized losses
Less than 12 months	631	2,749
12 months or longer	1,279	3,151
Total	$ 1,910	$ 5,900
No. of holdings | Holdings	205	406
States & political subdivisions
Fair value
Less than 12 months	$ 14,735	$ 5,867
12 months or longer	0	0
Total	14,735	5,867
Unrealized losses
Less than 12 months	59	7
12 months or longer	0	0
Total	$ 59	$ 7
No. of holdings | Holdings	7	3
Corporate debt securities
Fair value
Less than 12 months	$ 71,837	$ 172,831
12 months or longer	14,876	19,086
Total	86,713	191,917
Unrealized losses
Less than 12 months	407	2,447
12 months or longer	421	1,965
Total	$ 828	$ 4,412
No. of holdings | Holdings	152	349
Residential mortgage-backed securities
Fair value
Less than 12 months	$ 7,225	$ 9,827
12 months or longer	2,816	936
Total	10,041	10,763
Unrealized losses
Less than 12 months	27	84
12 months or longer	139	46
Total	$ 166	$ 130
No. of holdings | Holdings	11	9
Commercial mortgage-backed securities
Fair value
Less than 12 months	$ 18,373	$ 13,081
12 months or longer	8,426	19,081
Total	26,799	32,162
Unrealized losses
Less than 12 months	107	68
12 months or longer	686	1,021
Total	$ 793	$ 1,089
No. of holdings | Holdings	25	24
Collateralized debt obligations
Fair value
Less than 12 months	$ 11,092	$ 27,981
12 months or longer	8,727	9,174
Total	19,819	37,155
Unrealized losses
Less than 12 months	31	103
12 months or longer	33	118
Total	$ 64	$ 221
No. of holdings | Holdings	10	19
Other debt securities
Fair value
Less than 12 months		$ 1,960
12 months or longer		241
Total		2,201
Unrealized losses
Less than 12 months		40
12 months or longer		1
Total		$ 41
No. of holdings | Holdings		2
Common stock
Fair value
Less than 12 months		$ 12,732
12 months or longer		0
Total		12,732
Unrealized losses
Less than 12 months		133
12 months or longer		0
Total		$ 133
No. of holdings | Holdings		1