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Long-term debt, 2015 Convertible Notes (Details 2)
 1 Months Ended 12 Months Ended
Aug. 31, 2015
USD ($)
item
$ / shares
Dec. 31, 2015
USD ($)
Long-term debt    
Amortization of debt issuance costs   $ 107,000
3.00% Convertible senior notes due 2022 | Convertible debt    
Long-term debt    
Principal amount of Notes $ 150,000,000 150,000,000
Less: Debt discount, net   (55,392,000)
Net carrying amount   94,608,000
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  
Contractual interest expense   1,702,000
Amortization of debt issuance costs   107,000
Debt discount recorded to interest expense   2,146,000
Total   $ 3,955,000
Effective interest rate of the liability component (as a percent)   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%