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Investments (Details) (USD $) | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2012 Specialty Pharmaceutical Company [Member] | Sep. 30, 2012 Specialty Pharmaceutical Company [Member] | Dec. 31, 2011 Specialty Pharmaceutical Company [Member] | Mar. 31, 2012 Harbinger Fund [Member] | Sep. 30, 2012 Harbinger Fund [Member] | Dec. 31, 2011 Harbinger Fund [Member]
Total cash invested in private company |  | $ 7,500,000 | $ 7,500,000 |  |  |  |
Ownership interest percentage |  |  | 20.00% |  |  |  |
Carrying value |  | 26,600,000 | 26,600,000 | 17,600,000 |  |  |
Unrealized gain (loss) on investment under fair value method | 9,000,000 | 2,700,000 | 9,000,000 |  |  |  |
Percentage of discount on cash flows due to high degree of risk | 55.00% |  |  |  |  |  |
Weighted average cost of capital |  | 55.00% | 55.00% | 60.00% |  |  |
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 |  | 5,100,000 | 5,100,000 |  |  |  |
Decrease in fair value from five hundred point increase in weighted average cost of capital assumption |  | 5,900,000 | 5,900,000 |  |  |  |
Carrying value of investment |  |  |  |  |  | 3,600,000 | 5,200,000
Cost-method investment, OTTI |  |  |  |  | 1,100,000 |  |
Cost-method investment, OTTI net of tax |  |  |  |  | 700,000 |  |
Total withdrawal proceeds received | $ 500,000 |  |  |  |  |  |

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