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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 |
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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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