Revenue - Revenue by Timing of Transfer of Goods or Services (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Deferred Revenue Arrangement [Line Items]
Revenues	$ 439,743	$ 427,216	$ 497,647	$ 1,403,627	$ 1,487,314
Transferred at Point in Time [Member]
Deferred Revenue Arrangement [Line Items]
Revenues	27,934	30,443	37,618	96,738	110,103
Transferred over Time [Member]
Deferred Revenue Arrangement [Line Items]
Revenues	$ 411,809	$ 396,773	$ 460,029	$ 1,306,889	$ 1,377,211