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Debt (Schedule Of Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Total debt $ 347,237 $ 335,736
Less: current portion (11,762) (13,170)
Long-term debt 335,475 322,566
Senior Subordinated Notes [Member] | Convertible Senior Subordinated Notes due August 15, 2019, 4.25% [Member]
   
Debt Instrument [Line Items]    
Convertible Debt 165,296 149,800
Secured Debt [Member] | Secured Convertible Notes due June 2015 [Member]
   
Debt Instrument [Line Items]    
Convertible Debt 99,851 100,676
Term Loan [Member] | Silicon Valley Bank Loan And Security Agreement [Member]
   
Debt Instrument [Line Items]    
Silicon Valley Bank term loan 80,000 80,000
Line of Credit [Member] | Silicon Valley Bank Loan And Security Agreement [Member]
   
Debt Instrument [Line Items]    
Silicon Valley Bank Line of Credit $ 2,090 $ 5,260