Quarterly report pursuant to Section 13 or 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
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Class of Stock [Line Items]        
Stock Repurchased and Retired During Period, Shares     8,020,000 1,391,887
Common Stock, Capital Shares Reserved for Future Issuance 7,500,000   7,500,000  
Stock Issued and Outstanding, Shares, Dividend Reinvestment Plan 327,056   327,056  
Stock Issued and Outstanding, Value, Dividend Reinvestment Plan $ 3,315   $ 3,315  
Stock Issued During Period, Shares, Dividend Reinvestment Plan 14,621 17,904 43,764 54,088
Stock Issued During Period, Value, Dividend Reinvestment Plan $ 129 $ 177 $ 356 $ 556
Stock Repurchased and Retired During Period, Value     $ 61,307 $ 12,476