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Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Mar. 09, 2015
Jun. 30, 2015
Jun. 30, 2014
Class of Stock [Line Items]      
Shares issued, price per share $ 12.80    
Proceeds from sale of common stock $ 463,100 $ 463,010 $ 0
Common Stock [Member]      
Class of Stock [Line Items]      
Issuance of common stock, shares 36,800,000    
Additional Paid-in-Capital [Member]      
Class of Stock [Line Items]      
Proceeds from sale of common stock $ 462,700    
Common Stock [Member]      
Class of Stock [Line Items]      
Issuance of common stock, shares   36,800,000  
Proceeds from sale of common stock $ 400    
Over-Allotment Option [Member] | Common Stock [Member]      
Class of Stock [Line Items]      
Issuance of common stock, shares 4,800,000