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Intangible Assets and Goodwill - Schedule of Capitalized Internal-Use Software (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Capitalized Computer Software Net [Abstract]    
Gross capitalized internal-use software $ 113,298 $ 109,133
Less: Accumulated amortization (79,588) (75,853)
Capitalized internal use software, net $ 33,710 $ 33,280