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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Cash & cash equivalents $ 42,604 $ 44,167 $ 42,604 $ 44,167 $ 48,822 $ 68,939
Other long-term assets 47,350   47,350   49,559  
Total assets 793,294   793,294   783,165  
Long term debt, net of discount 134,000   134,000   128,000  
Equity 376,705   376,705   372,252  
Total liabilities and shareholders' equity 793,294   793,294   783,165  
Expenses and other, net (229,600) (200,842) (687,971) (616,567)    
Income tax (expense) benefit (2,937) (4,476) (12,185) (11,318)    
Net income 6,978 7,427 12,545 17,778    
Intelliject [Member]
            
Cash & cash equivalents 32,198   32,198   53,288  
Other current assets 9,289   9,289   686  
Patents 2,331   2,331   2,152  
Other long-term assets 9,737   9,737   4,278  
Total assets 53,555   53,555   60,404  
Long term debt, current portion 3,997   3,997      
Other current liabilities 4,242   4,242   13,405  
Non-current liabilities 2,895   2,895   1,449  
Long term debt, net of discount 10,766   10,766   14,696  
Redeemable preferred stock 21,724   21,724   20,995  
Equity 9,931   9,931   9,859  
Total liabilities and shareholders' equity 53,555   53,555   60,404  
Royalty revenues 7,904   12,420      
Expenses and other, net (5,604) (3,089) (12,515) (8,026)    
Income tax (expense) benefit (912) 1,209 322 3,100    
Net income $ 1,388 $ (1,880) $ 227 $ (4,926)