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Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Class of Stock [Line Items]    
Series D Preferred Stock, outstanding (in shares) 55,000 55,000
Preferred stock, par value (in dollars per share) $ 1 $ 1
Redemption of preferred stock   $ 1,000
Dividends paid for Series D Preferred Stock $ 399 $ 468
Series D Preferred Stock [Member]    
Class of Stock [Line Items]    
Series D Preferred Stock, outstanding (in shares) 55,000 55,000
Preferred stock, par value (in dollars per share) $ 100 $ 100
Accrued annual dividends rate (in dollars per share) $ 7.25 $ 7.25
Number of preferred stock shares convertible to common shares (in shares) 1,378,000  
Maximum number of common stock issuable from conversion of preference shares, without obtaining prior shareholder approval (in shares) 2,703,000  
Company redeemed shares (in shares)   10,000
Redemption of preferred stock   $ 1,000
Dividends accrued but unpaid $ 18 18
Dividends paid for Series D Preferred Stock $ 399 $ 471