Investments - Available-for-sale Securities in Unrealized Loss Positions (Details) $ in Thousands	Jun. 30, 2016 USD ($) security	Dec. 31, 2015 USD ($) security
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Less than 12 months, number of issues | security	69	248
Greater than 12 months, number of issues | security	24	22
Number of Issues | security	93	270
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	$ 12,458	$ 60,349
Greater than 12 months, fair value	6,584	6,551
Fair Value	19,042	66,900
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized losses	(51)	(781)
Greater than 12 months, unrealized losses	(58)	(139)
Unrealized losses	$ (109)	$ (920)
Total fixed maturity securities available for sale
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Less than 12 months, number of issues | security	22	162
Greater than 12 months, number of issues | security	20	19
Number of Issues | security	42	181
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	$ 12,001	$ 59,567
Greater than 12 months, fair value	6,451	6,472
Fair Value	18,452	66,039
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized losses	(29)	(709)
Greater than 12 months, unrealized losses	(45)	(104)
Unrealized losses	$ (74)	$ (813)
U.S. Government obligations
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Less than 12 months, number of issues | security	0	7
Greater than 12 months, number of issues | security	0	2
Number of Issues | security	0	9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	$ 0	$ 2,580
Greater than 12 months, fair value	0	679
Fair Value	0	3,259
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized losses	0	(7)
Greater than 12 months, unrealized losses	0	(6)
Unrealized losses	$ 0	$ (13)
State and local government
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Less than 12 months, number of issues | security	1	8
Greater than 12 months, number of issues | security	0	0
Number of Issues | security	1	8
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	$ 118	$ 2,688
Greater than 12 months, fair value	0	0
Fair Value	118	2,688
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized losses	(1)	(6)
Greater than 12 months, unrealized losses	0	0
Unrealized losses	$ (1)	$ (6)
Corporate debt
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Less than 12 months, number of issues | security	7	80
Greater than 12 months, number of issues | security	15	12
Number of Issues | security	22	92
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	$ 3,104	$ 21,760
Greater than 12 months, fair value	5,127	3,618
Fair Value	8,231	25,378
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized losses	(17)	(438)
Greater than 12 months, unrealized losses	(42)	(45)
Unrealized losses	$ (59)	$ (483)
Commercial mortgage-backed and other asset-backed
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Less than 12 months, number of issues | security	14	67
Greater than 12 months, number of issues | security	5	5
Number of Issues | security	19	72
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	$ 8,779	$ 32,539
Greater than 12 months, fair value	1,324	2,175
Fair Value	10,103	34,714
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized losses	(11)	(258)
Greater than 12 months, unrealized losses	(3)	(53)
Unrealized losses	$ (14)	$ (311)
Common stock
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Less than 12 months, number of issues | security	47	86
Greater than 12 months, number of issues | security	4	3
Number of Issues | security	51	89
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	$ 457	$ 782
Greater than 12 months, fair value	133	79
Fair Value	590	861
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized losses	(22)	(72)
Greater than 12 months, unrealized losses	(13)	(35)
Unrealized losses	$ (35)	$ (107)