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Convertible Senior Notes (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2015
USD ($)
item
$ / shares
Jun. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Long-term debt        
Amortization of debt issuance costs     $ 147,000  
3.00% Convertible senior notes due 2022 | Convertible debt        
Long-term debt        
Principal amount of notes $ 150,000,000 $ 150,000,000 150,000,000 $ 150,000,000
Less: Debt issuance costs   (2,613,000) (2,613,000) (2,760,000)
Less: Debt discount, net   (52,451,000) (52,451,000) (55,392,000)
Net carrying amount   94,936,000 94,936,000 $ 91,848,000
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      
Minimum percentage of principal held by convertible debt instrument holders required to issue notice for declaration of principal and unpaid interest payable upon events of default (as a percent) 25.00%      
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   71,300,000 $ 71,300,000  
Remaining contractual life of the convertible notes     6 years 1 month 6 days  
Contractual interest expense   1,125,000 $ 2,241,000  
Amortization of debt issuance costs   75,000 147,000  
Amortization of debt discount   1,495,000 2,941,000  
Total   $ 2,695,000 $ 5,329,000  
Effective interest rate of the liability component (as a percent)   11.00% 11.00%  
3.00% Convertible senior notes due 2022 | Convertible debt | Redemption on or after August 20, 2018        
Long-term debt        
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%      
Sinking fund $ 0