Segment and Geographic Information - Assets by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets by segment:
Total assets	$ 2,953,048	$ 1,890,850
Plus: reconciling corporate assets
Assets by segment:
Total assets	1,686,148	1,097,091
Operating Segments | U.S.
Assets by segment:
Total assets	1,076,733	738,600
Operating Segments | International
Assets by segment:
Total assets	190,167	55,159
Segment Reconciling Items
Assets by segment:
Total assets	$ 1,266,900	$ 793,759