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, 2016
Dec. 31, 2015
Dec. 31, 2014
Class of Stock [Line Items]      
Common Stock, Capital Shares Reserved for Future Issuance 7,500,000    
Stock Issued and Outstanding, Shares, Dividend Reinvestment Plan 343,894    
Stock Issued and Outstanding, Value, Dividend Reinvestment Plan $ 3,461    
Stock Issued During Period, Shares, Dividend Reinvestment Plan 60,602 69,826 57,218
Stock Issued During Period, Value, Dividend Reinvestment Plan $ 502 $ 691 $ 587