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Fair Value Measurement (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value Disclosures [Abstract]        
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability   $ 0 $ (11,206) $ (425)
Business Acquisition, Contingent Consideration, Actual Cash Payment $ 2,741 $ (7,000) $ 4,618