Segment Information - Revenue Classified by Major Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 264,730	$ 250,935	$ 499,500	$ 502,705
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	249,093	242,464	469,898	485,863
Europe/Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	13,757	7,666	26,124	15,335
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,880	$ 805	$ 3,478	$ 1,507