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Stock-Based Incentive Plans Nonvested Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award      
Nonvested at December 31, 2012 33,000    
Granted 28,000    
Vested (26,000)    
Nonvested at December 31, 2013 35,000 33,000  
Vested outstanding 75,000    
Nonvested, weighted average grant date fair value at December 31, 2011 $ 17.10    
Granted, weighted average grant date fair value 16.72 $ 0.00 $ 14.33
Vested, weighted average grant date fair value 18.48    
Nonvested, weighted average grant date fair value at December 31, 2012 15.78 $ 17.10  
Vested outstanding, weighted average grant date fair value $ 23.32