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Subsequent Events - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Oct. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Subsequent Event [Line Items]      
Proceeds from issuance of common shares   $ 29,736 $ 344
ATM Plan | Subsequent Event      
Subsequent Event [Line Items]      
Shares issued (in shares) 154,496    
Weighted average price of shares issued (in dollars per share) $ 21.27    
Proceeds from issuance of common shares $ 3,300    
DRSPP Plan | Subsequent Event      
Subsequent Event [Line Items]      
Shares issued (in shares) 377,192    
Weighted average price of shares issued (in dollars per share) $ 21.41    
Proceeds from issuance of common shares $ 8,100