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Fair Value Measurements (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
item
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Fair Value Measurements      
Number of employees covered under life insurance policies | item 42    
Combined face value of life insurance policies $ 31,300    
Cash surrender value 3,000   $ 3,100
Reconciliation of the fair value of contingent earn-out obligations that use significant unobservable inputs (Level 3)      
Goodwill, Impairment Loss   $ 1,105 1,105
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 7,993    
Issuances 1,000    
Settlements (298)    
Adjustments to fair value (153)    
Balance at end of period 8,542   7,993
Recurring basis | Total      
Fair Value Measurements      
Cash and cash equivalents 25,219   36,542
Life insurance - cash surrender value 2,950   3,128
Contingent earn-out obligations 8,542   7,993
Recurring basis | Quoted Market Prices In Active Markets for Identical Assets (Level 1)      
Fair Value Measurements      
Cash and cash equivalents 25,219   36,542
Recurring basis | Fair Value Measurements at Reporting Date Using Significant Other Observable Inputs (Level 2)      
Fair Value Measurements      
Life insurance - cash surrender value 2,950   3,128
Recurring basis | Significant Unobservable Inputs (Level 3)      
Fair Value Measurements      
Contingent earn-out obligations $ 8,542   $ 7,993
Non recurring basis | 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   $ 1,100