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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Cash & cash equivalents $ 44,427 $ 52,559 $ 44,427 $ 52,559 $ 48,822 $ 68,939
Other long-term assets 50,824   50,824   49,559  
Total assets 799,320   799,320   783,165  
Long term debt, net of discount 139,000   139,000   128,000  
Equity 368,119   368,119   372,252  
Total liabilities and shareholders' equity 799,320   799,320   783,165  
Expenses and other, net (229,302) (208,386) (458,371) (415,725)    
Income tax (expense) benefit (5,484) (2,710) (9,248) (6,842)    
Net income 1,290 7,353 5,567 10,351    
Intelliject [Member]
            
Cash & cash equivalents 35,534   35,534   53,288  
Other current assets 4,494   4,494   686  
Patents 2,206   2,206   2,152  
Other long-term assets 8,721   8,721   4,278  
Total assets 50,955   50,955   60,404  
Long term debt, current portion 2,626   2,626      
Other current liabilities 4,010   4,010   13,405  
Non-current liabilities 1,993   1,993   1,449  
Long term debt, net of discount 12,115   12,115   14,696  
Redeemable preferred stock 21,478   21,478   20,995  
Equity 8,733   8,733   9,859  
Total liabilities and shareholders' equity 50,955   50,955   60,404  
Royalty revenues 2,716   4,516      
Expenses and other, net (3,109) (2,448) (6,911) (4,937)    
Income tax (expense) benefit 148 941 1,235 1,891    
Net income $ (245) $ (1,507) $ (1,160) $ (3,046)