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General - Contingent Consideration (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2017
Fair value measurement of contingent consideration              
Estimated undiscounted future contingent payments $ 9,800   $ 9,800       $ 9,900
Fair value of short-term contingent consideration 7,062   7,062       6,892
Fair value of long-term contingent consideration 2,058   2,058       $ 1,925
Liability for contingent consideration              
Balance as of beginning of period     8,817        
Changes in fair value 70 $ 252 303 $ 203      
Balance as of end of period $ 9,120   $ 9,120        
Forecast              
Fair value measurement of contingent consideration              
Estimated undiscounted future contingent payments         $ 2,600 $ 7,200