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
6 Months Ended
Jun. 12, 2015
Apr. 21, 2015
Jun. 30, 2015
Jun. 30, 2014
Class of Stock [Line Items]        
Proceeds from issuance of common stock, net of offering costs and exercise of stock options $ 479,800 $ 501,900 $ 981,866 $ 648
Common Stock [Member]        
Class of Stock [Line Items]        
Stock issued in underwritten public offering (in shares) 11,500,000 10,925,000 22,425,000  
Common Stock [Member] | Underwritten Public Offering [Member]        
Class of Stock [Line Items]        
Stock issued in underwritten public offering (in shares) 1,500,000 1,425,000