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Stock Compensation (Details) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended
Jul. 02, 2013
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Stock compensation          
Grant of options to purchase (in shares)   547,492   547,492  
Options issued in 2008 to acquire shares that vested immediately       11,578  
Number of Shares          
Outstanding at the beginning of period (in shares) 188,491     223,951  
Expired (in shares)       (35,460)  
Outstanding at the end of period (in shares)   188,491   188,491  
Exercisable at the end of period (in shares)   173,974   173,974  
Weighted Average Exercise Price          
Outstanding at the beginning of period (in dollars per share) $ 24.11     $ 23.74  
Expired (in dollars per share)       $ 21.76  
Outstanding at the end of period (in dollars per share)   $ 24.11   $ 24.11  
Exercisable at the end of period (in dollars per share)   $ 24.28   $ 24.28  
Weighted Average Contractual Term (in years)          
Outstanding at the end of period       3 years  
Exercisable at the end of period       2 years 10 months 24 days  
Additional disclosures          
Stock dividend (as a percent) 4.00%        
Stock based compensation expense   $ 5,000 $ 9,000 $ 8,000 $ 20,000
Total unrecognized compensation expense related to non-vested stock awards   $ 61,000   $ 61,000  
Weighted average period is expected to be recognized       2 years  
Minimum
          
Stock compensation          
Options vest over periods       4 years  
Maximum
          
Stock compensation          
Options vest over periods       5 years