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Share-Based Compensation (Stock Option Awards) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options Outstanding, Number of Options 85,500 168,000  
Options Outstanding, Weighted-Avg. Remaining Contractual Life (Years) 3 years 1 month 6 days    
Options Outstanding, Weighted-Avg. Exercise Price (in dollars per share) $ 47.52 $ 48.14  
Options Exercisable, Number of Options 65,500    
Options Exercisable, Weighted-Avg. Exercise Price (in dollars per share) $ 48.73    
Options granted during period 0 0 0
Total fair value of stock options vested $ 142 $ 142 $ 142
$33.61-$45.30 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options Outstanding, Number of Options 41,000    
Options Outstanding, Weighted-Avg. Remaining Contractual Life (Years) 5 years 8 months 12 days    
Options Outstanding, Weighted-Avg. Exercise Price (in dollars per share) $ 42.44    
Options Exercisable, Number of Options 21,000    
Options Exercisable, Weighted-Avg. Exercise Price (in dollars per share) $ 41.40    
Range of Exercise Prices, lower limit (in dollars per share) 33.61    
Range of Exercise Prices, upper limit (in dollars per share) $ 45.30    
$47.61-$50.35 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options Outstanding, Number of Options 15,000    
Options Outstanding, Weighted-Avg. Remaining Contractual Life (Years) 1 year 3 months 18 days    
Options Outstanding, Weighted-Avg. Exercise Price (in dollars per share) $ 48.52    
Options Exercisable, Number of Options 15,000    
Options Exercisable, Weighted-Avg. Exercise Price (in dollars per share) $ 48.52    
Range of Exercise Prices, lower limit (in dollars per share) 47.61    
Range of Exercise Prices, upper limit (in dollars per share) $ 50.35    
$51.51-$54.93 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options Outstanding, Number of Options 29,500    
Options Outstanding, Weighted-Avg. Remaining Contractual Life (Years) 4 months 24 days    
Options Outstanding, Weighted-Avg. Exercise Price (in dollars per share) $ 54.06    
Options Exercisable, Number of Options 29,500    
Options Exercisable, Weighted-Avg. Exercise Price (in dollars per share) $ 54.06    
Range of Exercise Prices, lower limit (in dollars per share) 51.51    
Range of Exercise Prices, upper limit (in dollars per share) $ 54.93