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Stock-based Compensation (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized for issuance 1,500,000      
Share-Based Compensation $ 2,059,000 $ 2,041,000 $ 1,975,000 $ 1,976,000
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted 42,786 22,629 30,407  
Shares granted, weighted average grant date market value   $ 58.89 $ 42.21  
Vesting period 3 years      
Amortization of restricted stock bonus $ 1,514,000 $ 1,250,000 $ 1,176,000  
Total unrecognized compensation expense $ 1,734,000      
Total unrecognized compensation expense, weighted average period 8 months 5 days      
Total fair value of shares vested $ 1,089,000 1,066,000 $ 822,000  
SARs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation expense $ 265,000      
Total unrecognized compensation expense, weighted average period 6 months      
Total intrinsic value of options exercised $ 1,268,000 $ 716,000    
Average remaining contractual term 5 years 11 months 26 days 6 years 9 months 7 days    
Outstanding, Aggregate Intrinsic Value $ 4,577,000 $ 6,277,000    
Share-Based Compensation $ 545,000