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Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Feb. 02, 2016
Sep. 30, 2016
Sep. 30, 2015
Class of Stock [Line Items]      
Shares issued, price per share (in usd per share) $ 4.685    
Net proceeds from offering   $ 182,791 $ 462,833
Common Stock [Member]      
Class of Stock [Line Items]      
Issuance of common stock (in shares)   39,100,000  
Net proceeds from offering   $ 400  
Additional Paid-in-Capital [Member]      
Class of Stock [Line Items]      
Net proceeds from offering   $ 182,400  
Common Stock [Member]      
Class of Stock [Line Items]      
Issuance of common stock (in shares) 39,100,000    
Common Stock [Member] | Over-Allotment Option [Member]      
Class of Stock [Line Items]      
Issuance of common stock (in shares) 5,100,000