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Investments (Narrative) (Details) (USD $)	3 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Intelliject [Member]	Sep. 30, 2012 Intelliject [Member]	Sep. 30, 2013 Intelliject [Member]	Sep. 30, 2012 Intelliject [Member]	Dec. 31, 2012 Intelliject [Member]	Dec. 31, 2008 Intelliject [Member]	Aug. 31, 2007 Intelliject [Member]	Sep. 30, 2013 Harbinger Fund [Member]	Mar. 31, 2012 Harbinger Fund [Member]	Sep. 30, 2013 Harbinger Fund [Member]	Sep. 30, 2012 Harbinger Fund [Member]	Dec. 31, 2012 Harbinger Fund [Member]	Jun. 30, 2013 Alleghany And Bath County, Virginia [Member]	Sep. 30, 2013 Alleghany And Bath County, Virginia [Member]	Dec. 31, 2012 Alleghany And Bath County, Virginia [Member]
Total cash invested in private company									$ 7,500,000	$ 7,500,000
Ownership interest percentage						20.00%
Carrying value				33,800,000		33,800,000		33,700,000
Unrealized gain (loss) on investment under fair value method		100,000	9,000,000	(3,100,000)	2,700,000	100,000	9,000,000
Weighted average cost of capital	55.00%	55.00%				55.00%		55.00%
Basis point decrease of weighted average cost of capital assumption				5.00%		5.00%
Basis point increase of weighted average cost of capital assumption				5.00%		5.00%
Increase in fair value from five hundred point decrease in weighted average cost of capital assumption				5,000,000		5,000,000
Decrease in fair value from five hundred point increase in weighted average cost of capital assumption				4,000,000		4,000,000
Investment carrying value											3,200,000		3,200,000		3,600,000		5,900,000	6,900,000
Cost-method investment, OTTI											200,000	1,100,000				1,000,000	1,018,000
Cost-method investment, OTTI net of tax											100,000	700,000				600,000
Total withdrawal proceeds received													$ 200,000	$ 500,000

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