Revenue Recognition - Opening and Closing Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 676,738	$ 689,134	$ 630,119
Increase (decrease) in accounts receivables	(12,396)	59,015
Contract assets, current	13,534	10,033	9,778
Increase (decrease) in contract asset, current	3,501	255
Contract assets, non-current	54,050	31,521	16,396
Increase (decrease) in contract asset, non-current	22,529	15,125
Customer deposits	101,258	76,193	73,143
Increase (decrease) in deferred revenue, current	25,065	3,050
Deferred revenue, non-current	71,242	46,555	$ 46,641
Increase (decrease) in deferred revenue, non-current	$ 24,687	$ (86)