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Cash, cash equivalents and restricted cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 1,728,794 $ 1,248,772    
Restricted cash 185,959 246,518    
Total cash, cash equivalents and restricted cash $ 1,914,753 $ 1,495,290 $ 1,300,347 $ 1,415,035