Segment Information - Summarized Information by Geographic Location (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Long-lived assets:
Long-lived assets	$ 424,034	$ 415,249	$ 210,877
United States and Canada
Long-lived assets:
Long-lived assets	305,928	288,735	143,921
Europe, Middle East and Africa
Long-lived assets:
Long-lived assets	67,306	84,840	42,326
Other International
Long-lived assets:
Long-lived assets	$ 50,800	$ 41,674	$ 24,630