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Fair Value Measurements (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Fair Value Measurements      
Number of employees covered under life insurance policies | item 48    
Combined face value of life insurance policies $ 44,200    
Cash surrender value 3,700 $ 3,600  
Reconciliation of the fair value of contingent earn-out obligations that use significant unobservable inputs (Level 3)      
Goodwill, Impairment Loss     $ 727
Contingent earn-out obligations      
Reconciliation of the fair value of contingent earn-out obligations that use significant unobservable inputs (Level 3)      
Balance at beginning of year 450    
Issuances 3,240    
Settlements (428)    
Adjustments to fair value (731)    
Balance at end of period 2,531 450  
Significant Unobservable Inputs (Level 3)      
Reconciliation of the fair value of contingent earn-out obligations that use significant unobservable inputs (Level 3)      
Goodwill, Impairment Loss 0 $ 0 $ 700
Recurring basis | Total      
Fair Value Measurements      
Cash and cash equivalents 32,074    
Life insurance - cash surrender value 3,697    
Contingent earn-out obligations 2,531    
Recurring basis | Quoted Market Prices In Active Markets for Identical Assets (Level 1)      
Fair Value Measurements      
Cash and cash equivalents 32,074    
Recurring basis | Fair Value Measurements at Reporting Date Using Significant Other Observable Inputs (Level 2)      
Fair Value Measurements      
Life insurance - cash surrender value 3,697    
Recurring basis | Significant Unobservable Inputs (Level 3)      
Fair Value Measurements      
Contingent earn-out obligations $ 2,531