Investments Reconciliation, Investments by Category (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2013 security		Dec. 31, 2012 security		Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 245,379		$ 147,926
Available-for-sale Securities, Gross Unrealized Gains	3,176		4,603
Available-for-sale Securities, Gross Unrealized Losses	2,734		349
Other Long-term Investments	300		300
Equity securities (adjusted cost of $9,654 and $2,537, respectively)	12,177		2,723
Available-for-sale Securities, Debt Securities	233,344		149,157
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	139	[1]	30	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	2,717		331
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	124,894		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, 12 Months or Longer, Aggregate Losses	17		18
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	255		413
Total investments	245,821		152,180
U.S. government and agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	61,241				95,296
Available-for-sale Securities, Gross Unrealized Gains	36				201
Available-for-sale Securities, Gross Unrealized Losses	652				289
Available-for-sale Securities, Debt Securities	60,625		95,208
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	27		13
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	652		289
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	33,135		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, 12 Months or Longer, Aggregate Losses	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0		0
States, municipalities and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	45,782				17,117
Available-for-sale Securities, Gross Unrealized Gains	933				1,918
Available-for-sale Securities, Gross Unrealized Losses	395				0
Available-for-sale Securities, Debt Securities	46,320		19,035
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	23
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	395
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	27,307
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, 12 Months or Longer, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Public Utility, Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	8,607				4,135
Available-for-sale Securities, Gross Unrealized Gains	169				225
Available-for-sale Securities, Gross Unrealized Losses	78				0
Available-for-sale Securities, Debt Securities	8,698				4,360
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	78
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,338
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, 12 Months or Longer, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
All Other Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	118,065				28,282
Available-for-sale Securities, Gross Unrealized Gains	1,053				2,013
Available-for-sale Securities, Gross Unrealized Losses	1,417				1
Available-for-sale Securities, Debt Securities	117,701				30,294
Redeemable Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis					259
Available-for-sale Securities, Gross Unrealized Gains					2
Available-for-sale Securities, Gross Unrealized Losses					1
Available-for-sale Securities, Debt Securities			260
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions			0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses			0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value			0
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions			1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses			1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value			102
Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	233,695		145,089
Available-for-sale Securities, Gross Unrealized Gains	2,191		4,359
Available-for-sale Securities, Gross Unrealized Losses	2,542		291
Available-for-sale Securities, Debt Securities	233,344		149,157
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	98	[1]	14	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	2,542		290
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	121,102		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, 12 Months or Longer, Aggregate Losses	0		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0		102
Public Utility, Equities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	741				316
Available-for-sale Securities, Gross Unrealized Gains	16				16
Available-for-sale Securities, Gross Unrealized Losses	23				6
Equity securities (adjusted cost of $9,654 and $2,537, respectively)	734				326
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	23
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	455
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, 12 Months or Longer, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Other Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	10,371				1,949
Available-for-sale Securities, Gross Unrealized Gains	969				228
Available-for-sale Securities, Gross Unrealized Losses	152				38
Equity securities (adjusted cost of $9,654 and $2,537, respectively)	11,188				2,139
Nonredeemable Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	272				272
Available-for-sale Securities, Gross Unrealized Gains	0				0
Available-for-sale Securities, Gross Unrealized Losses	17				14
Equity securities (adjusted cost of $9,654 and $2,537, respectively)	255		258
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	0		0
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, 12 Months or Longer, Aggregate Losses	17		14
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	255		258
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	11,384		2,537
Available-for-sale Securities, Gross Unrealized Gains	985		244
Available-for-sale Securities, Gross Unrealized Losses	192		58
Equity securities (adjusted cost of $9,654 and $2,537, respectively)	12,177		2,723
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	41	[1]	16	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	175		41
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,792		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, 12 Months or Longer, Aggregate Losses	17		17
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	255		311
Other Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	300		300
Available-for-sale Securities, Gross Unrealized Gains	0				0
Available-for-sale Securities, Gross Unrealized Losses	0				0
Other Long-term Investments	$ 300		$ 300

[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.