Annual report pursuant to Section 13 and 15(d)

Public Offering of Common Stock (Details)

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Public Offering of Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 11, 2018
May 08, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Common stock, shares authorized     100,000,000   100,000,000
Common stock, par value     $ 0.01   $ 0.01
Shares of common stock sold     38,900,875   39,589,755
Proceeds from issuance of common stock     $ 132,964 $ 15,891  
May 2018 Offering          
Shares of common stock sold   3,000,000      
Public offering price (in dollars per share)   $ 41.00      
Proceeds from issuance of common stock $ 132,707        
May 2018 Offering | Underwriter          
Shares of common stock sold   450,000      
Number of days to underwriter to purchase additional common shares   30 days