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Stock Options and Stock-Based Compensation (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares of common stock reserved for issuance (in shares) 400,000  
Restricted stock granted (in shares) 19,727  
Compensation cost $ 302,000  
Compensation cost recognized for options granted 24,000 6,000
Unrecognized compensation costs 256,000 105,000
Granted in 1995 (in shares) 0  
Summary of status and changes of Stock Option Plan [Roll Forward]    
Outstanding, beginning of period (in shares) 51,000  
Granted in 1995 (in shares) 0  
Exercised in 2012 (in shares) (9,000)  
Forfeited in 2012 (in shares) 0  
Outstanding, end of period (in shares) 42,000 13,500
Exercisable, end of period (in shares) 42,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Outstanding options, weighted average exercise price, beginning of period (in dollars per share) $ 16.47  
Granted options, weighted average exercise price (in dollars per share) $ 0  
Exercised options, weighted average exercise price (in dollars per share) $ 9.33  
Forfeited options, weighted average exercise price (in dollars per share) $ 0  
Outstanding options, weighted average exercise price, end of period (in dollars per share) $ 18.00  
Exercisable options, weighted average exercise price, end of period (in dollars per share) $ 18.00  
Outstanding options, end of period, weighted average remaining contractual term (in years) 2.8  
Exercisable options, end of period, weighted average remaining contractual term (in years) 2.8  
Outstanding options, end of period, aggregate intrinsic value 0  
Exercisable options, end of period, aggregate intrinsic value $ 0  
1995 Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted in 1995 (in shares) 600,000  
Term of options, maximum (in years) 10Y  
Percentage of options vesting two years (in hundredths) 5.00%  
Vesting term, option one (in years) 2Y  
Percentage of options vesting five years (in hundredths) 50.00%  
Vesting term, option two (in years) 5Y  
Summary of status and changes of Stock Option Plan [Roll Forward]    
Granted in 1995 (in shares) 600,000