Revenue - Opening and Closing Balances (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 687,153	$ 689,134	$ 689,134
Increase (decrease) in accounts receivables	(1,981)
Contract asset, current	10,457	10,033
Increase (decrease) in contract asset, current	424
Contract asset, non-current	33,619	31,521
Increase (decrease) in contract asset, non-current	2,098
Deferred revenue, current	79,575	76,193
Increase (decrease) in deferred revenue, current	3,382
Deferred revenue, non-current	48,107	$ 46,555
Increase (decrease) in deferred revenue, non-current	$ 1,552