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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