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Convertible Notes (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Convertible notes, short-term $ 0 $ 164,047
Convertible notes, long-term 113,692 109,629
1.125% Convertible Senior Notes due 2018
   
Debt Instrument [Line Items]    
Principal amount of convertible notes 138,000  
Convertible Senior Notes
   
Debt Instrument [Line Items]    
Principal amount of convertible notes 138,000 310,500
Unamortized discount (24,308) (36,824)
Total convertible notes 113,692 273,676
Convertible notes, short-term 0 164,047
Convertible notes, long-term 113,692 109,629
Convertible Senior Notes | 5% Convertible Senior Notes due 2014
   
Debt Instrument [Line Items]    
Convertible notes stated interest rate (as a percent) 5.00% 5.00%
Principal amount of convertible notes 0 172,500
Unamortized discount 0 (8,453)
Total convertible notes 0 164,047
Convertible Senior Notes | 1.125% Convertible Senior Notes due 2018
   
Debt Instrument [Line Items]    
Convertible notes stated interest rate (as a percent) 1.125% 1.125%
Principal amount of convertible notes 138,000 138,000
Unamortized discount (24,308) (28,371)
Total convertible notes $ 113,692 $ 109,629