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Stock Compensation - Stock Compensation (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cancelled or Forfeited (in shares) 113,913 153,426 175,909
Allocated Share-based Compensation Expense $ 2,708,000 $ 2,595,000 $ 2,326,000
The total intrinsic value of all stock options exercised 1,502,000 117,000 14,000
Restricted Stock [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period, in years 3 years    
Restricted Stock [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period, in years 4 years    
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period, in years 10 years    
Total unrecognized compensation cost related to non-vested share based compensation arrangements $ 3,800,000    
Stock Options [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period, in years 3 years    
Recognition period (in years) 3 years    
Stock Options [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period, in years 5 years    
Recognition period (in years) 4 years    
2008 Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized for grant under plan (in shares) 3,000,000