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Revenue - Contract liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Revenue    
Deferred revenue $ 281,826 $ 234,352
Accrued loss provision 10,595 6,060
Contract liabilities 292,421 $ 240,412
Decrease in contract liabilities 52,000  
Revenue recognized included in contract liability at beginning of period $ 172,300