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Convertible Notes Payable - Narrative (Details)
1 Months Ended
Sep. 12, 2017
USD ($)
business_day
$ / shares
Sep. 30, 2017
USD ($)
Aug. 14, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]        
Long Term Debt   $ 162,759,000   $ 0
Convertible debt | 3.00% Convertible notes        
Debt Instrument [Line Items]        
Debt instrument face amount $ 5,000,000.0   $ 300,000,000  
Debt issuance costs, gross $ 9,400,000      
Debt instrument term 7 years      
Debt instrument stated rate 3.00%      
Debt instrument, conversion ratio 0.0204891      
Debt instrument, conversion price (in dollars per share) | $ / shares $ 48.81      
Long Term Debt   162,759,000 166,300,000  
Equity component   134,450,000 138,707,000  
Proceeds from the issuance of debt   $ 305,000,000 $ 305,000,000  
Debt discount, remaining discount amortization period 7 years      
Debt instrument, convertible, effective interest rate   12.91%    
Debt instrument, convertible, fair value   $ 308,500,000    
Convertible debt | 3.00% Convertible notes | Stock price trigger at greater than or equal to 130%        
Debt Instrument [Line Items]        
Debt instrument, convertible, threshold consecutive or non-consecutive trading days 20 days      
Debt instrument, convertible, threshold consecutive trading days 30 days      
Debt instrument, convertible, threshold percentage of stock price trigger 130.00%      
Convertible debt | 3.00% Convertible notes | Stock price trigger less than 98%        
Debt Instrument [Line Items]        
Debt instrument, convertible, threshold consecutive trading days 5 days      
Debt instrument, convertible, threshold percentage of stock price trigger 98.00%      
Debt instrument, convertible, threshold trading days | business_day 5      
Convertible debt | 3.00% Convertible notes | Stock price trigger at greater than or equal to 130%, on or after September 1, 2021        
Debt Instrument [Line Items]        
Debt instrument, convertible, threshold consecutive or non-consecutive trading days 20 days      
Debt instrument, convertible, threshold consecutive trading days 30 days      
Debt instrument, convertible, threshold percentage of stock price trigger 130.00%      
Debt instrument, convertible, threshold consecutive trading days, redemption notice period 5 days      
Notes payable | Convertible debt | 3.00% Convertible notes        
Debt Instrument [Line Items]        
Debt issuance costs, gross $ 4,300,000      
Additional paid-in capital | Convertible debt | 3.00% Convertible notes        
Debt Instrument [Line Items]        
Debt issuance costs, gross $ 5,100,000