Quarterly report pursuant to Section 13 or 15(d)

Equity Dividend Reinvestment and Direct Stock Purchase Plan (Details)

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Equity Dividend Reinvestment and Direct Stock Purchase Plan (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Equity [Abstract]        
Number of common shares reserved for issuance under dividend reinvestment plan (in shares) 3,750,000   3,750,000  
Number of common shares issued from dividend reinvestment plan and outstanding as of period-end (in shares) 191,635   191,635  
Accumulated proceeds from issuance of common shares from dividend reinvestment plan $ 3,845   $ 3,845  
Number of common shares issued during period from dividend reinvestment plan (in shares) 6,469 7,310 19,688 21,882
Proceeds from issuance of common shares during period from dividend reinvestment plan $ 129 $ 129 $ 384 $ 356