Revenue - Contract Balances and Transaction Price Allocated to the Remaining Performance Obligation (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Accounts Receivable
Accounts Receivables - Opening	$ 737,733	$ 333,858
Accounts Receivables - Closing	610,755	238,638
(Increase)/decrease	126,978	95,220
Current portion of deferred revenues
Current portion of deferred revenues - Opening	707,318	407,325
Current portion of deferred revenues - Closing	579,935	326,098
(Increase)/decrease	127,383	81,227
Non-current portion of deferred revenues
Non-current portion of deferred revenues - Opening	41,399	19,723
Non-current portion of deferred revenues - Closing	44,934	24,080
(Increase)/decrease	$ (3,535)	$ (4,357)