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Fair Value Measurements (Details) (USD $)
3 Months Ended
Mar. 31, 2013
item
Dec. 31, 2012
Mar. 31, 2013
Contingent earn-out obligation
Mar. 31, 2013
Recurring basis
Total
Mar. 31, 2013
Recurring basis
Quoted Market Prices In Active Markets for Identical Assets (Level 1)
Mar. 31, 2013
Recurring basis
Significant Other Observable Inputs (Level 2)
Mar. 31, 2013
Recurring basis
Significant Unobservable Inputs (Level 3)
Fair Value Measurements              
Cash and cash equivalents       $ 25,435,000 $ 25,435,000    
Life insurance - cash surrender value       2,530,000   2,530,000  
Contingent earn-out obligations       1,993,000     1,993,000
Number of employees covered under life insurance policies 39            
Combined face value of life insurance policies 38,500,000            
Cash surrender value 2,500,000 2,500,000          
Reconciliation of the fair value of contingent earn-out obligations that use significant unobservable inputs (Level 3)              
Balance at beginning of year     1,966,000        
Adjustments to fair value     27,000        
Balance at end of period     $ 1,993,000