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Investments (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2012 Specialty Pharmaceutical Company [Member] | Jun. 30, 2011 Specialty Pharmaceutical Company [Member] | Jun. 30, 2012 Specialty Pharmaceutical Company [Member] | Jun. 30, 2011 Specialty Pharmaceutical Company [Member] | Dec. 31, 2011 Specialty Pharmaceutical Company [Member] | Mar. 31, 2012 Harbinger Fund [Member] | Jun. 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 |  |  |  |  |  |  | 23,900,000 |  | 23,900,000 |  | 17,600,000 |  |  |
Unrealized gain (loss) on investment under fair value method |  |  | 6,300,000 |  |  |  | 2,700,000 |  | 6,300,000 |  |  |  |  |
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 |  |  |  |  |  |  | 4,600,000 |  | 4,600,000 |  |  |  |  |
Decrease in fair value from five hundred point increase in weighted average cost of capital assumption |  |  |  |  |  |  | 3,500,000 |  | 3,500,000 |  |  |  |  |
Net income (loss) | 7,353,000 | 5,703,000 | 10,351,000 | 12,371,000 |  |  | (1,500,000) | 200,000 | (3,000,000) | 600,000 |  |  |  |
Operating profit or loss included in licensing revenues |  |  |  |  |  |  |  | 3,300,000 |  | 6,600,000 |  |  |  |
Cash and cash equivalents | 52,559,000 | 93,784,000 | 52,559,000 | 93,784,000 | 68,939,000 | 73,191,000 | 22,800,000 |  | 22,800,000 |  | 9,600,000 |  |  |
Total assets | 754,414,000 |  | 754,414,000 |  | 780,610,000 |  | 29,200,000 |  | 29,200,000 |  | 17,100,000 |  |  |
Carrying value of investment |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 | 5,200,000
Cost-method investment, OTTI |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |
Cost-method investment, OTTI net of tax |  |  |  |  |  |  |  |  |  |  |  | 700,000 |  |
Total withdrawal proceeds received |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |

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