Segment Information - Revenue Classified by Major Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 276,259	$ 234,793	$ 775,759	$ 737,498
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	265,606	227,001	735,504	712,864
Europe/Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	9,152	7,257	35,276	22,592
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,501	$ 535	$ 4,979	$ 2,042