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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 |
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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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