Segment and Geographic Information - Schedule of Segment Reconciled to Consolidated Amounts (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Assets by segment	$ 3,007,635	$ 1,890,850
U.S.
Segment Reporting Information [Line Items]
Assets by segment	1,482,542	670,344
International
Segment Reporting Information [Line Items]
Assets by segment	190,498	56,177
Total reportable segments assets
Segment Reporting Information [Line Items]
Assets by segment	1,673,040	726,521
Plus: reconciling corporate assets
Segment Reporting Information [Line Items]
Assets by segment	$ 1,334,595	$ 1,164,329