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Investments (Schedule Of Fair Value Method Investments, Balance Sheets And Income Statements) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Cash & cash equivalents $ 37,685 $ 70,816 $ 48,822 $ 68,939
Other long-term assets 49,760   49,559  
Total assets 789,129   783,165  
Long term debt, net of discount 118,000   128,000  
Equity 379,223   372,252  
Total liabilities and shareholders' equity 789,129   783,165  
Expenses and other, net (229,069) (207,339)    
Income tax (expense) benefit (3,764) (4,132)    
Net income (loss) 4,277 2,998    
Intelliject [Member]
        
Cash & cash equivalents 39,013   53,288  
Other current assets 3,171   686  
Patents 2,176   2,152  
Other long-term assets 6,633   4,278  
Total assets 50,993   60,404  
Long term debt, current portion 1,322      
Other current liabilities 4,466   13,405  
Non-current liabilities 1,738   1,449  
Long term debt, net of discount 13,397   14,696  
Redeemable preferred stock 21,235   20,995  
Equity 8,835   9,859  
Total liabilities and shareholders' equity 50,993   60,404  
Royalty revenues 1,800      
Expenses and other, net (3,802) (2,489)    
Income tax (expense) benefit 1,087 950    
Net income (loss) $ (915) $ (1,539)