Investments - Available-for-sale Securities in Unrealized Loss Positions (Details) $ in Thousands	Mar. 31, 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	62	248
Greater than 12 months, number of issues | security	23	22
Number of Issues | security	85	270
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	$ 14,755	$ 60,349
Greater than 12 months, fair value	8,267	6,551
Fair Value	23,022	66,900
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized losses	(362)	(781)
Greater than 12 months, unrealized losses	(72)	(139)
Unrealized losses	$ (434)	$ (920)
U.S. Government obligations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Less than 12 months, number of issues | security	2	7
Greater than 12 months, number of issues | security	2	2
Number of Issues | security	4	9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	$ 1,330	$ 2,580
Greater than 12 months, fair value	685	679
Fair Value	2,015	3,259
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized losses	(1)	(7)
Greater than 12 months, unrealized losses	(1)	(6)
Unrealized losses	$ (2)	$ (13)
State and local government [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Less than 12 months, number of issues | security	3	8
Greater than 12 months, number of issues | security	0	0
Number of Issues | security	3	8
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	$ 499	$ 2,688
Greater than 12 months, fair value	0	0
Fair Value	499	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 [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Less than 12 months, number of issues | security	22	80
Greater than 12 months, number of issues | security	10	12
Number of Issues | security	32	92
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	$ 8,736	$ 21,760
Greater than 12 months, fair value	3,251	3,618
Fair Value	11,987	25,378
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized losses	(304)	(438)
Greater than 12 months, unrealized losses	(29)	(45)
Unrealized losses	$ (333)	$ (483)
Commercial mortgage and asset-backed [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Less than 12 months, number of issues | security	10	67
Greater than 12 months, number of issues | security	9	5
Number of Issues | security	19	72
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	$ 3,667	$ 32,539
Greater than 12 months, fair value	4,255	2,175
Fair Value	7,922	34,714
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized losses	(7)	(258)
Greater than 12 months, unrealized losses	(30)	(53)
Unrealized losses	$ (37)	$ (311)
Fixed maturity securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Less than 12 months, number of issues | security	37	162
Greater than 12 months, number of issues | security	21	19
Number of Issues | security	58	181
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	$ 14,232	$ 59,567
Greater than 12 months, fair value	8,191	6,472
Fair Value	22,423	66,039
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized losses	(313)	(709)
Greater than 12 months, unrealized losses	(60)	(104)
Unrealized losses	$ (373)	$ (813)
Common Stock [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Less than 12 months, number of issues | security	25	86
Greater than 12 months, number of issues | security	2	3
Number of Issues | security	27	89
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	$ 523	$ 782
Greater than 12 months, fair value	76	79
Fair Value	599	861
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized losses	(49)	(72)
Greater than 12 months, unrealized losses	(12)	(35)
Unrealized losses	$ (61)	$ (107)