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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Equity [Abstract]        
Number of common shares reserved for issuance under dividend reinvestment plan (in shares) 7,500,000.0   7,500,000.0  
Number of common shares issued from dividend reinvestment plan and outstanding as of period-end (in shares) 370,332   370,332  
Accumulated proceeds from issuance of common shares from dividend reinvestment plan $ 3,716   $ 3,716  
Number of common shares issued during period from dividend reinvestment plan (in shares) 15,173 14,495 26,438 29,143
Proceeds from issuance of common shares during period from dividend reinvestment plan $ 154 $ 118 $ 256 $ 228