Revenue - Contract liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Revenue
Deferred revenue	$ 382,350	$ 269,853
Accrued loss provision	5,417	6,094
Contract liabilities	387,767	$ 275,947
Increase in contract liabilities	111,800
Revenue recognized included in contract liability at beginning of period	$ 228,300