Investments Aging of Unrealized Losses by Class (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2013 security		Dec. 31, 2012 security
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	$ 12		$ 18
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	2,712		331
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	154,784		46,794
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	2	[1]	4	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	260		413
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	163	[1]	30	[1]
U.S. government and agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	560		289
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	46,611		44,174
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	0	[1]	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0		0
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	32		13
States, municipalities and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	414		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	28,300		0
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	0	[1]	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0		0
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	24		0
Public Utility, Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	72
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	4,353
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	0	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	4
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	1,550		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	71,515		2,000
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	0	[1]	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0		0
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	61		1
Redeemable Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0		0
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	0	[1]	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0		102
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	0		0
Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	2,596		290
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	150,779		46,174
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	0	[1]	1	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0		102
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	121	[1]	14	[1]
Public Utility, Equities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	221
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	5
Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0		3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	114		41
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,784		620
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	0		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0		53
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	37		16
Nonredeemable Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	12		14
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0		0
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	2		2
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	260		258
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	0		0
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	12		17
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	116		41
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	4,005		620
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	2	[1]	3	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 260		$ 311
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	42	[1]	16	[1]

[1] This amount represents the actual number of discrete securities, not the number of shares of those securities. The numbers are not presented in thousands.