Investments (Details) Available for Sale Investments (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Schedule of Available-for-sale Securities
Cost, Total	$ 67,214		$ 71,081
Gross Unrealized Gains	9,988		8,529
Gross Unrealized Losses	(414)		(1,334)
Fixed maturities, Carrying Value	29,284		36,598
Marketable equity securities, Carrying Value	47,504		41,678
Total available-for-sale investments	76,788		78,276
Available-for-sale Securities, Continuous Unrealized Loss Position
Less than 12 months, Fair Value	9,324		12,170
Less than 12 months, Gross Unrealized Loss	411		528
Greater than 12 months, Fair Value	2,160		5,575
Greater than 12 months, Gross Unrealized Loss	3		806
Marketable Equity Securities
Schedule of Available-for-sale Securities
Marketable equity securities, Cost	38,992		35,547
Gross Unrealized Gains	8,915		7,341
Gross Unrealized Losses	(403)		(1,210)
Marketable equity securities, Carrying Value	47,504		41,678
Available-for-sale Securities, Continuous Unrealized Loss Position
Less than 12 months, Fair Value	6,188		7,847
Less than 12 months, Gross Unrealized Loss	403		461
Greater than 12 months, Fair Value			2,757
Greater than 12 months, Gross Unrealized Loss			749
Other-than-temporary impairment charges on marketable equity securities	922	0
Fixed Maturities Total
Schedule of Available-for-sale Securities
Fixed maturities, Cost	28,222		35,534
Gross Unrealized Gains	1,073		1,188
Gross Unrealized Losses	(11)		(124)
Fixed maturities, Carrying Value	29,284		36,598
Available-for-sale Securities, Continuous Unrealized Loss Position
Less than 12 months, Fair Value	3,136		4,323
Less than 12 months, Gross Unrealized Loss	8		67
US Treasury Securities
Schedule of Available-for-sale Securities
Fixed maturities, Cost	5,370		7,053
Gross Unrealized Gains	187		227
Gross Unrealized Losses	(1)
Fixed maturities, Carrying Value	5,556		7,280
Available-for-sale Securities, Continuous Unrealized Loss Position
Less than 12 months, Fair Value	551		553
Less than 12 months, Gross Unrealized Loss	1
Municipal Bonds
Schedule of Available-for-sale Securities
Fixed maturities, Cost	3,111		3,118
Gross Unrealized Gains	281		297
Gross Unrealized Losses
Fixed maturities, Carrying Value	3,392		3,415
Corporate Bonds
Schedule of Available-for-sale Securities
Fixed maturities, Cost	18,741		23,738
Gross Unrealized Gains	546		588
Gross Unrealized Losses	(10)		(124)
Fixed maturities, Carrying Value	19,277		24,202
Available-for-sale Securities, Continuous Unrealized Loss Position
Less than 12 months, Fair Value	2,585		3,770
Less than 12 months, Gross Unrealized Loss	7		67
Greater than 12 months, Fair Value	2,160		2,818
Greater than 12 months, Gross Unrealized Loss	3		57
US Government-sponsored Enterprises
Schedule of Available-for-sale Securities
Fixed maturities, Cost	1,000		1,625
Gross Unrealized Gains	59		76
Gross Unrealized Losses
Fixed maturities, Carrying Value	$ 1,059		$ 1,701