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Investments (Details 3)
$ in Thousands
Dec. 31, 2015
USD ($)
Holdings
Dec. 31, 2014
USD ($)
Holdings
Fair value    
Less than 12 months $ 244,279 $ 201,458
12 months or longer 48,518 15,067
Total 292,797 216,525
Unrealized losses    
Less than 12 months 2,882 3,648
12 months or longer 3,151 191
Total $ 6,033 $ 3,839
No. of holdings | Holdings 407 295
Investment grade    
Fair value    
Less than 12 months $ 174,723 $ 145,364
12 months or longer 38,369 2,378
Total 213,092 147,742
Unrealized losses    
Less than 12 months 1,296 949
12 months or longer 1,256 15
Total $ 2,552 $ 964
No. of holdings | Holdings 105 58
Non-investment grade    
Fair value    
Less than 12 months $ 56,824 $ 56,094
12 months or longer 10,149 0
Total 66,973 56,094
Unrealized losses    
Less than 12 months 1,453 2,699
12 months or longer 1,895 0
Total $ 3,348 $ 2,699
No. of holdings | Holdings 301 236
Fixed maturities    
Fair value    
Less than 12 months $ 231,547 $ 201,458
12 months or longer 48,518 2,378
Total 280,065 203,836
Unrealized losses    
Less than 12 months 2,749 3,648
12 months or longer 3,151 15
Total $ 5,900 $ 3,663
No. of holdings | Holdings 406 294
States & political subdivisions    
Fair value    
Less than 12 months $ 5,867 $ 6,251
12 months or longer 0 2,378
Total 5,867 8,629
Unrealized losses    
Less than 12 months 7 10
12 months or longer 0 15
Total $ 7 $ 25
No. of holdings | Holdings 3 4
Corporate debt securities    
Fair value    
Less than 12 months $ 172,831 $ 120,850
12 months or longer 19,086 0
Total 191,917 120,850
Unrealized losses    
Less than 12 months 2,447 3,064
12 months or longer 1,965 0
Total $ 4,412 $ 3,064
No. of holdings | Holdings 349 250
Residential mortgage-backed securities    
Fair value    
Less than 12 months $ 9,827 $ 5,702
12 months or longer 936 0
Total 10,763 5,702
Unrealized losses    
Less than 12 months 84 19
12 months or longer 46 0
Total $ 130 $ 19
No. of holdings | Holdings 9 4
Commercial mortgage-backed securities    
Fair value    
Less than 12 months $ 13,081 $ 40,865
12 months or longer 19,081 0
Total 32,162 40,865
Unrealized losses    
Less than 12 months 68 455
12 months or longer 1,021 0
Total $ 1,089 $ 455
No. of holdings | Holdings 24 24
Collateralized debt obligations    
Fair value    
Less than 12 months $ 27,981 $ 20,985
12 months or longer 9,174 0
Total 37,155 20,985
Unrealized losses    
Less than 12 months 103 72
12 months or longer 118 0
Total $ 221 $ 72
No. of holdings | Holdings 19 9
Other debt securities    
Fair value    
Less than 12 months $ 1,960 $ 6,805
12 months or longer 241 0
Total 2,201 6,805
Unrealized losses    
Less than 12 months 40 28
12 months or longer 1 0
Total $ 41 $ 28
No. of holdings | Holdings 2 3
Common stock    
Fair value    
Less than 12 months $ 12,732 $ 0
12 months or longer 0 12,689
Total 12,732 12,689
Unrealized losses    
Less than 12 months 133 0
12 months or longer 0 176
Total $ 133 $ 176
No. of holdings | Holdings 1 1