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2.25% Convertible Senior Notes Due 2019 (Carrying Amounts of Liability and Equity Components - Additional Information) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Debt Instrument [Line Items]    
Transaction costs related to the equity component $ 1,177  
2.25% Convertible Senior Notes Due 2019 [Member]    
Debt Instrument [Line Items]    
Debt instrument, interest rate   2.25%
2.25 % Convertible Senior Notes Due 2019 [Member] | 2.25% Convertible Senior Notes Due 2019 [Member]    
Debt Instrument [Line Items]    
Remaining period over which the unamortized debt discount will be amortized 4 years