Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity Dividend Reinvestment and Direct Stock Purchase Plan (Details)

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Stockholders' Equity Dividend Reinvestment and Direct Stock Purchase Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]      
Number of common shares reserved for issuance under dividend reinvestment plan (in shares) 3,750,000    
Number of common shares issued from dividend reinvestment plan and outstanding as of period-end (in shares) 199,141    
Accumulated proceeds from issuance of common shares from dividend reinvestment plan $ 3,967    
Number of common shares issued during period from dividend reinvestment plan (in shares) 27,194 30,301 34,913
Proceeds from issuance of common shares during period from dividend reinvestment plan $ 506 $ 502 $ 691