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
9 Months Ended
Mar. 15, 2016
Sep. 30, 2016
Sep. 30, 2015
Class of Stock [Line Items]      
Proceeds from issuance of common stock, net of offering costs   $ 411,711 $ 981,568
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 $ 411,700    
Common Stock | Over-Allotment Option      
Class of Stock [Line Items]      
Stock issued in underwritten public offering (in shares) 2,205,000