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Convertible Senior Notes (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2015
USD ($)
item
$ / shares
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Net carrying amount   $ 93,198,000 $ 93,198,000
Amortization of debt issuance costs     37,000
3.0% Convertible senior notes due 2022 | Convertible debt      
Principal amount of Notes $ 150,000,000 150,000,000 150,000,000
Less: Debt discount, net   (56,802,000) (56,802,000)
Net carrying amount   93,198,000 93,198,000
Interest rate 3.00%    
Net proceeds from issuance of convertible notes $ 145,400,000    
Trading days, number | item 20    
Consecutive trading days, period 30 days    
Stock price trigger (as a percent) 130.00%    
Business days, period 5 days    
Consecutive trading-day period 5 days    
Common stock per principal amount $ 1,000    
Maximum product of the closing sale price of shares of the Company's common stock and the applicable conversion rate for such trading day (as a percent) 98.00%    
Conversion ratio 17.7487    
Conversion price per share | $ / shares $ 56.34    
Convertible debt instrument holders required to issue notice for declaration of principal and unpaid interest payable upon events of default (as a percent of principal amount by instrument holders) 25    
Convertible Instruments Principal And Unpaid Interest Payable Upon Events Of Default 100.00%    
Term of the convertible notes 7 years    
Net deferred tax liability in connection with convertible notes $ 22,300,000    
Fair value of convertible notes   93,200,000 $ 93,200,000
Remaining contractual life of the convertible notes     6 years 10 months 24 days
Contractual interest expense   584,000  
Amortization of debt issuance costs   37,000  
Amortization of debt discount   736,000  
Total   $ 1,357,000  
Effective interest rate of the liability component (as a percent)   11.00% 11.00%
3.0% Convertible senior notes due 2022 | Convertible debt | Redemption on or after August 20, 2018      
Trading days, number | item 19    
Consecutive trading days, period 30 days    
Stock price trigger (as a percent) 130.00%    
Redemption price (as a percent) 100.00%