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Common Stock - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 09, 2015
Dec. 09, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]          
Shares issued, price per share (in usd per share) $ 12.80 $ 44.94      
Proceeds from sale of common stock $ 462,800   $ 462,833 $ 0 $ 314,580
Common stock, par value (in usd per share)     $ 0.01 $ 0.01  
Proceeds from issuance of common stock   $ 314,400      
Principal payments on revolving credit facility     $ 992,000 $ 455,570 $ 264,430
Revolving credit facility          
Class of Stock [Line Items]          
Principal payments on revolving credit facility   $ 264,400      
Common stock          
Class of Stock [Line Items]          
Issuance of common stock, shares 36,800,000 7,000,000      
Common stock, par value (in usd per share)   $ 0.01      
Common stock | Underwriters' option          
Class of Stock [Line Items]          
Issuance of common stock, shares 4,800,000        
Common stock          
Class of Stock [Line Items]          
Issuance of common stock, shares     36,800,000   7,000,000
Proceeds from sale of common stock $ 400        
Proceeds from issuance of common stock   $ 70      
Additional paid-in capital          
Class of Stock [Line Items]          
Proceeds from sale of common stock $ 462,400        
Proceeds from issuance of common stock   $ 314,300