Quarterly report pursuant to Section 13 or 15(d)

Common Stock And Changes In Capitalization (Details)

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Common Stock And Changes In Capitalization (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 09, 2016
Mar. 31, 2016
Class of Stock [Line Items]    
Proceeds from issuance of common stock, net of offering costs and exercise of stock options   $ 411,918
Common Stock | Over-Allotment Option    
Class of Stock [Line Items]    
Stock issued in underwritten public offering (in shares) 2,205,000  
Common Stock | Public Offering    
Class of Stock [Line Items]    
Stock issued in underwritten public offering (in shares) 16,905,000  
Proceeds from issuance of common stock, net of offering costs and exercise of stock options $ 411,900