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Business Acquisition (Details) - Cost & Compliance Associates [Member] - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Feb. 28, 2017
Sep. 30, 2018
Feb. 23, 2017
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross $ 10,000    
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 8,000    
Business combination, contingent consideration, liability $ 5,900 $ 3,500 $ 5,954
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability   $ 700