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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]        
Common stock, authorized shares (in shares)   500,000,000 500,000,000  
Common stock, par value (in dollars per share)   $ 0.01 $ 0.01  
Common stock, issued shares (in shares)   77,307,521 76,610,508  
Common stock, outstanding shares (in shares)   77,307,521 76,610,508  
Shares issued under underwritten public offering (in shares) 14,123,150      
Shares exercised in full of over-allotment option by underwriter (in shares) 1,842,150      
Shares price (in dollars per share) $ 28.50      
Underwriter's discount and offering expenses $ 24,800      
Net proceeds from the sale of shares $ 377,700 $ 0 $ 377,656 $ 0
Preferred stock, authorized (in shares)   200,000,000 200,000,000  
Preferred stock, par value (in shares)   $ 0.01 $ 0.01  
Preferred stock, shares issued (in shares)   0 0  
Preferred stock, shares outstanding (in shares)   0 0  
Stock options to purchase common stock        
Class of Stock [Line Items]        
Common stock shares reserved for issuance (in shares)   9,381,730    
Restricted stock and restricted stock units        
Class of Stock [Line Items]        
Common stock shares reserved for issuance (in shares)   227,826