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Acquisitions, Intangible Assets and Goodwill - Schedule of Capitalized Internal-Use Software (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Capitalized Computer Software Net [Abstract]    
Gross capitalized internal-use software $ 117,737 $ 109,133
Less: Accumulated amortization (83,292) (75,853)
Capitalized internal use software, net $ 34,445 $ 33,280