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Goodwill and Intangible Assets - Schedule of Goodwill (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Beginning balance - December 31, 2017 $ 23,130
GM&P measurement period adjustment 431
Ending balance - September 30, 2018 $ 23,561