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Investments (Narrative) (Details) (USD $)	6 Months Ended		3 Months Ended		6 Months Ended					3 Months Ended	6 Months Ended			3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Intelliject [Member]	Jun. 30, 2012 Intelliject [Member]	Jun. 30, 2013 Intelliject [Member]	Jun. 30, 2012 Intelliject [Member]	Dec. 31, 2012 Intelliject [Member]	Dec. 31, 2008 Intelliject [Member]	Aug. 31, 2007 Intelliject [Member]	Mar. 31, 2012 Harbinger Fund [Member]	Jun. 30, 2013 Harbinger Fund [Member]	Jun. 30, 2012 Harbinger Fund [Member]	Dec. 31, 2012 Harbinger Fund [Member]	Jun. 30, 2013 Alleghany And Bath County, Virginia [Member]	Jun. 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			36,900,000		36,900,000		33,700,000
Unrealized gain (loss) on investment under fair value method	3,200,000	6,300,000	2,100,000	2,700,000	3,200,000	6,300,000
Weighted average cost of capital	55.00%		55.00%		55.00%		55.00%
Basis point decrease of weighted average cost of capital assumption			500		500
Basis point increase of weighted average cost of capital assumption			500		500
Increase in fair value from five hundred point decrease in weighted average cost of capital assumption			4,000,000		4,000,000
Decrease in fair value from five hundred point increase in weighted average cost of capital assumption			6,000,000		6,000,000
Carrying value of investment											3,400,000		3,600,000	5,900,000	5,900,000	6,900,000
Cost-method investment, OTTI										1,100,000				1,018,000	1,018,000
Cost-method investment, OTTI net of tax										700,000				600,000
Total withdrawal proceeds received											$ 200,000	$ 100,000

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